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Old 04-24-2012, 08:31 PM   #1
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sq foot limits

browsed through rockwood catalog and a lot of trailers were 9 ft plus tall and 8 ft wide, many tow vehicles have a 60 sq ft limit. is the basic calc. of height vs width appropriate or is a different calculation used? if basic, than an f150 technically is not supposed to pull any rockwood roo campers.

am i missing something?
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Old 04-24-2012, 08:42 PM   #2
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I'm guessing your talking about the frontal area of a trailer. If so I never seen a sq foot rating on a tv.
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Old 04-24-2012, 08:47 PM   #3
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Quote:
Originally Posted by cyclepuck View Post
I'm guessing your talking about the frontal area of a trailer. If so I never seen a sq foot rating on a tv.
Nor have I.....Maybe I"m missing something.
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Old 04-24-2012, 08:50 PM   #4
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i havent seen sq ft numbers for tts eithe thats why i was calculating from the specs..

here's the brochure i was looking at

http://www.forestriverinc.com/nd/def...rec&choice=roo

here's where i saw ford 2004 frontal area considerations.

https://www.fleet.ford.com/showroom/...Equipments.pdf
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Days Camped 2012 = 42
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Local Ohio CGs - Punderson SP and West Branch SP
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Old 04-24-2012, 08:59 PM   #5
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That is just stating to take frontal area into consideration when selecting a tv because of the extra resistance. Basically saying if you have a 500lb trailer with 96 sq ft of frontal area you might not want to pull it with a focus because of the lack of power. Plus your tv will be blocking a percentage of that area.
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Old 04-24-2012, 09:05 PM   #6
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The trailers are 9 foot plus tall, but you can't use that in your calculation. The 9 foot is from the ground, and the trailers don't drag the ground. You would need to know the height of the front wall, usually around 7.5 to maybe 8 feet. Some more, some less.

To be accurate, you need to know the height of the front wall, and the width, which is given. Also, the frontal area in tow vehicle ratings, is for a flat nose trailer, which I have, but not that many are. If you want to get in to slopes and curves, and "V" nose.... that would require a calculus class in night school.

Well, hope some of this helped. Just remember, height is from the ground, not true height of front wall.
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Old 04-24-2012, 09:53 PM   #7
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ok google results

http://www.rv.net/forum/index.cfm/fu...d/24698487.cfm

this topic has been pursued before and appears to have no right/wrong answer.

oh well. i am enjoying the learning
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Old 04-24-2012, 10:22 PM   #8
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Ford puts a SF rating in their manuals - and often other things. Tow ratings for YOUR SPECIFIC vehicle need to be figured out - you cannot go by the very general and optimistic figures you find online or in 'towing guides'. For example, according to my manual the 17" rim option reduces my GCWR by 500 lbs. You don't find that info online very easily, if at all. Tow ratings always assume a pretty stripped truck - so it weighs less so teh trailer can be heavier and still be under the GCWR. The 'books' say I can tow 8900 lbs when realistically 6000, perhaps 6500 is more like it, if i want to stay under the GCWR. That's a big difference.

One of the reasons I chose the trailer I did was because of it's very sloped front. My expy can pull it to 70mph no problem. I assume mileage drops as speed increases so I don't cruise at that speed, but it's nice to know I can if needed.

But the added drag taxes the drivetrain - as does GCWR of your loaded road ready rig. It can be handy to know what transmission you have - ford has made several over the years and in my case, I've got the 'big one' so I'm not too concerned about overtaxing it (as it's also used in F350s).
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