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DancherBoi's avatar
DancherBoi
Explorer
Jul 18, 2013

Can I tow this?

I am in the market for a travel trailer and have my eye on a 29 foot used Hi-Lo Classic. I have a 2007 Chevy Avalanche to tow it with, but I have the feeling it's not man enough for the job.

I have done tons of homework, but need the teacher to grade it. So here goes...

2007 Chevy Avalanche 5.3L V8 Axle Ration 3.73. Manufacturer specs are...
UVW (Unloaded Vehicle Weight) = 5750
Max Loaded Trailer Weight = 7250 (GCWR - UVW)
GCWR (Total Allowable Weight of Loaded Tower & Trailer) = 13000
GVWR (Total Allowable Weight of the Tow Vehicle) = 7000

The private party seller took his truck and the trailer to a CAT scale. The Hi-Lo company specs the trailer weight is 5750 dry and without optional accessories (Rough guesses - 50 for an A/C unit and 100 for an awning = 5900), that puts 4700 of that CAT scale weight on the trailer axles, and leaves 1200 of it loaded onto the hitch/rear axle of his vehicle. That's 20.34% of the trailer weight pushing on the rear of the vehicle at the hitch, which appears to be the norm. (However, this doesn't account for the weight distribution hitch that will be included which adds more weight...not sure how much though.)

My truck can only allow 7000 on both of it's axles. If I put 4 passengers in my truck (500), have a full tank of gas (186) and add some of the gear I need (50)...that puts my total truck load at 6526 before you add a trailer to it.

Put the 1200 from the trailer on my hitch, now I am up to 7726 on my truck...which is 726 over my GVWR of 7000. The sad part is, that means I can only accommodate 474 pounds of hitch weight...ever. At 20% of trailer weight, my maximum total trailer weight is 2370. Not sure what I can trailer with that?

Now from a different perspective...towable weight. My max is around 7250

Take 5900 for the trailer, then I add 80 for 2 full propane tanks, and 200 for gear, that's 6180 without water in the tank. 6180 is under my max of 7250, but as many people online suggest, you should stay within 80%, which puts my max at 5800. Now I am 380 over my max. If I fudge it a little bit and say 85%, then I am dead on.

And finally, my GCWR (Total Allowable Weight of Loaded Tower & Trailer) is 13000.

If I take my loaded truck weight of 6526 and subtract that from my GCWR of 13000, that gives me 6474 for my trailer. The trailer with all the options and loaded with everything I need for a trip puts me at 6180. So I am 294 under, which is good, but again, if I allow a 20% buffer (max now at 5179), I am now 1000 over.

Am I doing this right? If so, it looks like my truck can't handle this thing. We expect to do some driving up into the northern Arizona mountains, which will put strain on my truck?

So go...or no go?

15 Replies

  • You have a lot of fuzzy math in there and IMO poor estimates.

    The Hi-Lo company specs the trailer weight is 5750 dry and without optional accessories (Rough guesses - 50 for an A/C unit and 100 for an awning = 5900), that puts 4700 of that CAT scale weight on the trailer axles, and leaves 1200 of it loaded onto the hitch/rear axle of his vehicle


    That seems hard to believe, 1200 pounds of hitch weight. Maybe he wasn't using a WDH and saw 1200 pound increase in rear axle weight. If accurate, your receiver is not rated to handle it.

    Still, 5750 dry spec weight, 6700 pounds loaded for a long weekend, 7k tow rating, too close.

    80% rule is a guideline many people recommend because they do not do the math and/or underestimate weights. Where did you get the 6526 pounds of the loaded Ave from? How much payload does the Tire and Loading sticker say you have on the driver's door or door jam?

  • bikendan wrote:

    IMHO, i would never tow that long and heavy a trailer with my Avy.


    x2
    bumpy
  • i own an '07 Avy with the 3.73.
    i tow a 24' HTT that has a UVW of 4471lbs. and weighs around 5000lbs. loaded for camping. i have a 4-point Equalizer.
    we live in NorCal and have numerous mountain ranges to get over.

    i would not tow anything over 6000lbs. loaded, if you have to deal with mountains.
    for me, my combo is perfect.

    IMHO, i would never tow that long and heavy a trailer with my Avy.
  • For a fifth wheel, the rule of thumb is to have 20% to 25% on the hitch.

    Travel trailers are much less hitch weight, and should be between 10% and 15%. So if your maximum you "Should" put on the hitch is only about 500 pounds, it would limit you to a 5,000 pound trailer.

    Remember that say you hitch up a 5,000 pound trailer, and then apply the 510 pounds of hitch weight, and tighten the hitch WD bars, some weight will transfer from the tow vehicle to the trailer axles. Your trailer weight might increase by as much as 80 - 100 pounds once hitched up.

    in this exaple, the trailer weight went from 7840 to 8,000 pounds once the WD bars are tight.

    http://forums.woodalls.com/Index.cfm/fuseaction/thread/tid/26921756.cfm

    Fred.

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