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Old 03-09-2016, 08:00 AM   #1
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Brand New Trailer - Axles Too Light for GVWR

I am looking for some input for a friend. He is about to take delivery of a new Momentum Toy Hauler and I am sure the same situation exists with other trailers. The issue I pointed out to him is this: The trailer as advertised by the manufacturer states the GVWR is 16,500 lbs. The two axles are 7000 lbs each and the tires are rated at 3420 lbs. each so neither the tires nor the axles will handles this rig fully loaded. I've pointed him to the Bridgestone Duravis r250 as they are simply rock solid, but I am also telling him to have larger axles installed if the factory will not do it. Any input from you all would be great!

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Old 03-09-2016, 08:05 AM   #2
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Usually, they account for the truck handling some of the weight.

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Old 03-09-2016, 08:17 AM   #3
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The rest of that weight is calculated as hitch/pin weight.
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Old 03-09-2016, 08:21 AM   #4
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Brand New Trailer - Axles Too Light for GVWR

The truck hauls the missing weight in your calculations

Look at the pin weight number, that should be your missing weight.

All manufacturers do it the same.

The momentum that I looked up had a 3100 lb pin weight!

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Old 03-09-2016, 08:22 AM   #5
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Originally Posted by CaptainKirk14 View Post
I am also telling him to have larger axles installed if the factory will not do it. Any input from you all would be great!

They won't, Grand designs lists all their toy hauler 5ers as having 7K axles. Interestingly the numbers do not work on one model, the 327M, which shows it being 50lb over although those website specs do not mean much, the yellow sticker does. The pin weight on all the others is more than 2500lbs so the numbers work. Barely with no room for a buffer other than the buffer that's already engineered into everything.
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Old 03-09-2016, 09:08 AM   #6
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Sometimes I have to relearn things I guess - I forgot about the pin weight! Jeeze. Ok. Well, that's that. Thanks guys!
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Old 03-09-2016, 10:33 AM   #7
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The part that annoys me is the tires don't add up to support the axle! THAT'S NOT RIGHT!

You shouldn't have 6,840 lbs. of carrying capacity on a 7,000 lb. axle. IMO, if there's still a warranty on this thing- he should have a case for going up in load capacity on the tires. If not under warranty, he should load it up and get individual wheel weights done. I did and found that I was overloading 1 tire and within 20 lbs. of maximum capacity on 2 others.
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Old 03-09-2016, 01:52 PM   #8
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Mine is same-o same-o.. I try to tell people it isn't axles alone that determine GVW. But if you hit GVW before the tire rating is exceeded who cares. My axles 5200# tires 2540# trailer total gross on sticker 9970# less a TW of at least 1000#. 8970# net / 2 = less than 4500# on each axles / 2 (again) = 2250# each tire... Under all max ratings. That's the way it is; if want more they make more capable THs every day and a dealer would love to sell you one.
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Old 03-09-2016, 02:12 PM   #9
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Weight verses Axles

We purchased a trailer listed at 7000 pounds with two 3500 pound axles and a cargo weight listing of 750 pounds, exactly the listed hitch weight. It was our first RV and we did not pay enough attention to the specs. Simply filling the fresh water tank, adding the propane tanks and a spare tire left us with approximately 200 pounds. Adding food, clothing, bedding and other odds and ends quickly put us overweight. We burned up a wheel bearing a ruined an axle on the first trip major trip, but that was after the factory installed tires begin failing at 2000 miles. Forest River replaced the axle and tires under warranty. On a subsequent trip we burned another wheel bearing and fried the second axle. As we were on the road, we needed a quick replacement. We found a dealer that had a 5200 axle in stock. It would fit, but required that we upgrade to heavier six bolt rims. Later in the same trip, we hit a pot hole between Fairbanks and Anchorage which broke a rear spring and caused that axle to fry a bearing. We had the axle and rims and all of the springs replaced with a 5200 pound parts matching the previous replacement. The trailer now rides much better and we have a 3000 pound cargo capacity and no worries about how much we load up. We are not full timers, but take numerous short trips and one long one each year. We no longer worry about the running gear. We special ordered our trailer and added several options. I really wish that the manufacturers would offer heavier springs, axles and rims as a kit. It would costs less than doing it later and would save lots of grief for buyers.
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Old 03-09-2016, 02:38 PM   #10
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To the OP, hitch/pin weight is taken into account as part of the load disbursement. Almost all trailers are specd to the limit, if you want a more capable unit you have to step in in price/quality/brand.

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axle, light, trailer

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