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Old 02-21-2014, 08:12 PM   #11
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Kaadk's Avatar
Join Date: Apr 2013
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Originally Posted by Costalots View Post
Hi Wolf Whistle, is this excel tool availabe? Would you want to email it to me?


There's a good calculator available online here:

Travel Trailer Weight Calculator

and if you need Ram specs, I use the ones from here:

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Old 02-21-2014, 08:38 PM   #12
Join Date: May 2012
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I am by no means telling you to ignore the weight ratings on the sticker of the truck. Some people will not go over the payload some people ignore that figure. It's up to you. I have a 2006 dodge 2500 diesel with Manuel transmission. I tow a sabre 33ckts 5th wheel. My loaded pin weight including the 5th wheel hitch is 2600lbs. I have towed several thousand miles thru Va, Nc, and Tn with zero problems. I do have air bags to level the load. The decision is yours.

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Old 02-21-2014, 10:35 PM   #13
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what is the difference in riding w/wo air bags? are these aftermarket installed?
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Old 02-22-2014, 07:33 AM   #14
Join Date: May 2012
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Yea these are aftermarket. They are the air lift load lifter 5000. With no load on the truck I let all the air out of them and the truck rides just like stock. With a load on the truck they smooth out the ride and take the bounce out of the suspension. I run around 50psi in them with my fifth wheel hooked up. If you put to much air in them it takes all the load off the rear springs and feels like you are sitting on a beach ball, real mushy. You just have to find out how much air to run to get the ride you want. The new air bags have the jounce bumpers built into them. Hope I answered your question.
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Old 02-22-2014, 09:49 AM   #15
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uhm, by the way, I got this fater market 5 yrs. ago for a tundra and it says, always keep while unloaded at least 10 psi in it in order not to quenche the airbags.....\regards Costalots
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Old 02-22-2014, 12:12 PM   #16
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Mine said the same thing but they ride to rough with 10 pounds of air in them. Never had a problem. The new ones with the jounce bumper in them would prevent that also. When you let the air out of them the are not compressed so you are just equalizing the pressure in them to the outside. But with the valve stems in place you cannot fully compress them because they will still build pressure inside as they are compressed.
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Old 02-23-2014, 05:14 AM   #17
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I tow with the Air Lift 5000 and Helwig max tow sway bar on the rear end. The frame, engine/trans and drive line are the same as a 3500. The bags give your frame a third point of support, helping the leaf springs. Stay with in the max weight of the truck with the coach empty. The added equipment will take care of the extra weight. Always weigh your rig before a trip. The coach pin weight can be reduced by loading the rear of the coach. CHECK YOUR TIRE LOAD RATINGS!!!

The 2500 ram C.T.D. is the same truck as the 3500 C.T.D. EXCEPT for the over load spring leaf and frame brackets on the rear axle. As you can see in my sig, I have a similar setup with our Sanibel 3600. The needed changes to the truck are;
AirLift Ultimate 5000 air bags (I also installed the compressor kit )
Hellwig rear stabilizer bar for heavy towing (not the standard bar)
#74030017 AAM rear differential cover for the 11.5" axle
Trailer light circuit protector ( this is to protect the T.I.P.M. in your truck ) ( $2,000.00 repair to the truck if your trailer wiring shorts out )
Curt T-Connector ( so you can splice in the circuit protector to the T-Connector and then just plug in )CURT Manufacturing

2007 Dodge 2500 CTD 2W.D. short bed Weight

Truck weighed with 250 lb driver, Hellwig rear sway kit, Air Lift kit, Super Glide #2900
hitch and bed rail kit, 34gal. of diesel in fuel tank, stock tires rated 3,195 lbs @ 80 psi. each.

Air bags at 10 psi. Truck has stock suspension.

Factory weight rating on the drivers door;
Front GAWR = 4,750 lbs @ 50 psi front tire pressure
Rear GAWR = 6,010 lbs @ 70 psi rear tire pressure
GVWR =9,000
GCWR = 20,000 lbs
Maximum combined weight rating = 2,472 lbs of cargo and passengers

Actual weight;

Front = 4,060 lbs
Rear = 3,220 lbs
Total = 7,280 lbs

The weight capacity left is

Front = 690 lbs.
Rear = 2,790 lbs

The rim rating on the rear is 3,005 lbs. ( this is calculated from the service manual statement that
the max tire pressure on the door is the max rim weight rating ) (the front tire rims and suspension will
have a greater side load on them in a turn then the rear tire rims thus reducing the front rims weight rating )
Increasing the tire pressure does NOT increase the rim or suspension weight capacity in a turn.
The rear axle rim rating on the 3500 SRW increases to 3,100 lbs @ 75 psi each. This matches the
industry standard light truck tire inflation table for the inflation pressure of a 265/70R 17E Single Tire.
The rim rating statement looks to be a legal "C.Y.A." rating so no one can claim that they were misled
to think the axle or rim rating is higher than the GAWR on the door sticker.

Truck with Sanibel 3600 5th wheel coach, 2 men @ 250 lbs each and 28 gal. of fuel & 100 lbs of tools in back seat.
New Trail Air pin box installed, 1 full & one 1/4 - 30 lbs propane tanks and 300 lbs in front cargo hold of Sanibel.

Actual weight;

Front = 4,220
Rear = 6,120
Trailer x2 axles = 10,640

Actual GCWR = 20,980

At the wheel well lip;
With out Sanibel
The rear height = 38 1/2" @ 10 psi
The front height = 34 1/2"

With Sanibel
The rear height = 36" @ 40 psi.
The front height = 34"

2013 Sanibel 3600 5th, 2007Dodge 2500 Cummins Turbo Diesel, 2WD, 4.10gears, Banks equipped, 18" factory rims
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