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Old 09-30-2011, 09:52 PM   #1
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changing gears tt weight calculator

what am I doing wrong?


I don't know if I am doing anything wrong on that site but once I enter all the numbers for my 2010 Dodge Ram 4X4 1500 with the Hemi, it looks as if I can tow close to 7000 lbs.
When I enter the Tow vehicle RGAW which is the actual gross vehicle weight of the tow vehicle without trailer attached; in that box, I entered the number that was taken from the weigh in. we had two of us, two small dogs, hitch and a full tank of gas 61730 lbs . The program then tells me my maximum trailer should be 3513 lbs with a 527 lbs tw.
What is wrong here? it just seems wrong
When I weight the truck and trailer ( which weigh in loaded around 5700 lbs ), I am 80 lbs over my GVWR of 6700 but this weight calculator seems way off for some reason and I cannot make any sense of it.
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Old 09-30-2011, 10:18 PM   #2
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Welcome to the world of 1/2 ton towing. Confusion abounds. Most people are convinced that since they bought a truck (1/2 ton) they should be able to tow the world. In real life depending on what rear end ratio your grocery getter has you should be able to safely handle between a 5000 and 7000 pound trailer. 10% of that is around 700 pounds. But with a properly setup equalizer type hitch some of that weight will be transferred to the front axle and you will be just fine.
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Old 10-01-2011, 01:41 AM   #3
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I don't want to be picky, but you typed in post #1, original post "When I enter the Tow vehicle RGAW which is the actual gross vehicle weight of the tow vehicle without trailer attached;"

Notice the RGAW, to me that means rear gross axle weight, not the GVWR which is the gross vehicle weight rating. Are you putting in the right numbers? Did you miss type something here? Just trying to help.
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Old 10-01-2011, 07:09 AM   #4
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Quote:
Originally Posted by windrider View Post
I don't want to be picky, but you typed in post #1, original post "When I enter the Tow vehicle RGAW which is the actual gross vehicle weight of the tow vehicle without trailer attached;"

Notice the RGAW, to me that means rear gross axle weight, not the GVWR which is the gross vehicle weight rating. Are you putting in the right numbers? Did you miss type something here? Just trying to help.
This is why I asked the question... I MUST be mixing the numbers up
so the GVWR is 6700
Tow vehicle RGAWR is 3900 (so is the front)
and
Tow vehicle RGAW
Enter actual weight of tow vehicle's rear axle (Rear Gross Axle Weight), without trailer attached. That would be the number of the truck on the scale with people and dogs in it. So the number that came up on the CAT scale yellow sheet, I took the number from Drive Axle with is 2644

Are these the right numbers in the right places?
I don't have time now, but if not, of for the sake of clarity, I'll take a pic of the CAT yellow sheet and you can show me what I am doing wrong
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Old 10-01-2011, 07:13 AM   #5
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Randy is correct.

RAGW is the actual weight of your rear axle (WITHOUT the trailer attached); not the entire truck in that spreadsheet.

Travel Trailer Weight Calculator
Right under RAGW it explains it.

RGAWR is your truck's maximum rear axle rating.

GVW (GTW) is your camper's Maximum "legal" Gross Weight Rating

GVWR is yout truck's maximum gros weight rating.

Actual Tounge weight is found by disconnecting the trailer while on the scales with the wheekls on one plate and the front skid on the plate in front of it.

It can also be calculated PROVIDED you take the WD bars (if equipped) OFF the hitch. Then weight the truck and camper together (with no WD bars connected); then drop the trailer and come back and just weigh the truck. Subtract the truck's weight (unhitched) from the truck's weight hitched (WD bars disconnected) and that will give true tounge weight as well.

Tounge weight can also be found in your drive way by using the instructions in the link below and a bathroom scale.
Tongue Weight Scale

Don't forget to take a reading of the board and pipe on the scale first (Tare Weight) and subtract that weight from the weight of the camper's tongue when added.
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File Type: pdf Weigh Your RV - Bridgestone.pdf (447.2 KB, 24 views)
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Old 04-23-2012, 11:21 AM   #6
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I was reading this again and realized the mistake in calculation.
The changing gears program prompts me to enter :Tow vehicle GVW
Enter actual weight (Gross Vehicle Weight) of tow vehicle.
Now, if I enter the number that is on the door, no problem, if I enter 5400 lbs with me and fuel, same, no problem. But if bump it up to 6173 lbs with full load, then the numbers tumble down.
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Old 04-23-2012, 12:23 PM   #7
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Quote:
Originally Posted by boubou View Post
I was reading this again and realized the mistake in calculation.
The changing gears program prompts me to enter :Tow vehicle GVW
Enter actual weight (Gross Vehicle Weight) of tow vehicle.
Now, if I enter the number that is on the door, no problem, if I enter 5400 lbs with me and fuel, same, no problem. But if bump it up to 6173 lbs with full load, then the numbers tumble down.
This does not sound right still.

The program has boxes from top to bottom.
Put the numbers in order here from top to bottom so we can check the entries.

Lou
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Old 04-23-2012, 06:37 PM   #8
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Lou, these first numbers are with empty truck at 5400 lbs
Item Qty Units Weight (lb)* Weight (kg)*
Tow vehicle GVWR
Enter Gross Vehicle Weight Rating as provided by tow vehicle manufacturer.
6,700 lb
Tow vehicle GCWR

Enter Gross Combination Weight Rating as provided by tow vehicle manufacturer.
14,000 lb

Tow vehicle maximum loaded trailer weight rating
Enter rating as provided by vehicle manufacturer.
8,450 lb

Tow vehicle maximum tongue weight rating
Enter rating as provided by vehicle or hitch manufacturer, whichever is less.
1,045 lb

Tow vehicle RGAWR
Enter Rear Gross Axle Weight Rating as provided by tow vehicle manufacturer.
3,900 lb

Tow vehicle GVW
Enter actual weight (Gross Vehicle Weight) of tow vehicle.
5,400 lb

Tow vehicle RGAW
Enter actual weight of tow vehicle's rear axle (Rear Gross Axle Weight), without trailer attached.

Trailer GVW (or GTW)
Enter actual weight (Gross Vehicle Weight or Gross Trailer Weight) of trailer.
5,800 lb

Trailer tongue weight
Enter actual tongue weight of trailer.
750 lb

Calculation Results
Maximum Trailer Weight
This is the maximum trailer weight based on the most restrictive tow vehicle ratings provided (tongue weight rating at 15% of trailer weight).

6,967 lb
Maximum Tongue Weight
This is the recommended maximum tongue weight, based on 15% of the calculated Maximum Trailer Weight.

1,045 lb

all is good, until I start adding people and gear into the truck. Bump it up to 6000 lbs (appx, have to go weigh again, last weigh was 6100 lbs with nothing in the bed, so makes no sense)

all I changed is the TV GVW
the results:
Maximum Trailer Weight

Trailer GVW exceeds Maximum Trailer Weight. The provided trailer GVW (or GTW) exceeds the calculated maximum trailer weight. You should either lighten the trailer or provide additional information for a more accurate calculation.
4,667 lb
Maximum Tongue Weight

Tongue weight exceeds Maximum Tongue Weight. The provided trailer tongue weight exceeds the calculated maximum tongue weight. You should either lighten the trailer or provide additional information for a more accurate calculation.
700 lb

if I put in 6175 for tv like I think it was weight at, I get a maximum trailer at
Maximum Trailer Weight
This is the maximum trailer weight based on the most restrictive tow vehicle ratings provided (GVWR - GVW remainder for tongue weight at 15% of trailer weight).

Trailer GVW exceeds Maximum Trailer Weight. The provided trailer GVW (or GTW) exceeds the calculated maximum trailer weight. You should either lighten the trailer or provide additional information for a more accurate calculation.
3,500 lb Maximum Tongue Weight
This is the recommended maximum tongue weight, based on 15% of the calculated Maximum Trailer Weight.

Tongue weight exceeds Maximum Tongue Weight. The provided trailer tongue weight exceeds the calculated maximum tongue weight. You should either lighten the trailer or provide additional information for a more accurate calculation.
525 lb

Crazy.
The way I read this, add a couple hundred pound in the truck, loose a couple thousand pound in the trailer.
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Old 04-23-2012, 07:22 PM   #9
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Quote:
Originally Posted by boubou View Post
we had two of us, two small dogs, hitch and a full tank of gas 61730 lbs .
Wow - That's a heavy truck, or the dogs aren't that small (I won't say anything about the two people)!

(Sorry - I'm just joshin' with you, I couldn't resist!)
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Old 04-23-2012, 07:29 PM   #10
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That's the reason I need to weigh truck again. There is a tonneau cover and running boards. 4x4 with 20 inch wheels.
I weigh 135 , spouse is 175, a chihuahua, a 25 lbs sheltie and another 13 lbs dog. I even loaded the truck very lightly, nothing in the bed.
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