Exceeding truck GAWR and/or payload (by a smidge)

[CWSWine]

You shouldn't have a problem with front axle, here is a heavier 5er with B&W hitch set about 2 inches in front of the axle. Unloaded weight 4740 and loaded weight 5000 and here is the detail weighting of a 310GK https://www.granddesignowners.com/forum/showthread.php/9165-Solitude-310GK-R-Cat-Scale-Weights

 

[backtrack2015]

Thank you everyone for the helpful examples and comments. At this point I feel like I have a good shot at keeping both the front axle under GAWR and the overall vehicle under the listed GVWR as originally intended.

 

[Just Krusen]

Our steer axle weight did not change either. 5380 with & w/o the trailer. 3860 on the Curt 25 hitch.

 

[backtrack2015]

You shouldn't have a problem with front axle, here is a heavier 5er with B&W hitch set about 2 inches in front of the axle. Unloaded weight 4740 and loaded weight 5000 and here is the detail weighting of a 310GK https://www.granddesignowners.com/forum/showthread.php/9165-Solitude-310GK-R-Cat-Scale-Weights

What bothers me about this is it really isn't consistent with what I would expect based on statics. The 3100# pin load is 2" in front of the rear axle (which I am imagining as the fulcrum). An upward force of only 44 lbs at the front axle (143" away) is all that is needed to balance that torque. Yet it looks like the front axle is supplying 260 pounds.

 

[rtraviator]

Because that is what the bearing/weight limitations are for my rig.

Please explain the bearing limitations and where I can find data, thanks.

 

[CWSWine]

Please explain the bearing limitations and where I can find data, thanks.

I think what he might be talking about is on GMC there bearing in the rear end that has the same part number except of the dash number at the end. The parts guy at GMC showed me the example with both bearings having the same part number but one said 2500 and the other said 2500/3500 and but one had had -7 and other had a -9 on the end of the part number. Parts manual didn't list the dash number but to order you required to put in the vin.

 

[CWSWine]

What bothers me about this is it really isn't consistent with what I would expect based on statics. The 3100# pin load is 2" in front of the rear axle (which I am imagining as the fulcrum). An upward force of only 44 lbs at the front axle (143" away) is all that is needed to balance that torque. Yet it looks like the front axle is supplying 260 pounds.

I have owned 4 different 5ers and weight them all and all of them shifted some weight to the front axles, it was not alot but some. I think the Solitude had the most shift of any of the 5ers I owned but also had the pin weight.

 

[backtrack2015]

I have owned 4 different 5ers and weight them all and all of them shifted some weight to the front axles, it was not alot but some. I think the Solitude had the most shift of any of the 5ers I owned but also had the pin weight.

If the pin is in front of the axle then there should be some weight transfer to the front axle, no question about that. I appreciate you providing that detailed loading information for everyone to use.

 

[Jerry & Barbara]

I have a 2016 F-250 6.7L CCSB, 4x4 Lariat, Ultimate package, chrome package, mud flaps, upfitter switches, homelink. Pretty similar to yours, but not exact. I weighed my truck prior to installing the Anderson Ultimate hitch, then again with hitch and trailer connected.

Front axle GAWR 5100 Empty weight 4860 weight with trailer 4880
Rear axle GAWR 6100 Empty weight 3160 weight with trailer 5240

Not the same trailer, buy a very minimal increase of the front axle weight.
perhaps this information will help you a bit.
The hitch is installed with the ball located behind the rear axle, and it gives me plenty of room for tight turns.

 

[Light Chaser]

Getting ready to take our first big trip with our Reflections 327RST to see the eclipse and want to make sure I am ok towing wise,,, Camper 34 feet long hitch weight from broacher 2130 lbs GVWR 13995 from broacher I remember seeing on the new tag that the camper empty weight a little over 10,000,,,I plan on towing light, so we took her to the scales and this is what the report was. Steer axle 4960, Drive Axle 5880, Trailer Axle 9020, and Gross weight 19860,, that was with a tow vehicle a for F-250 2013 6.7 Super Duty with 3 200 pound guys in it,,, Am I ok?

 

[backtrack2015]

Getting ready to take our first big trip with our Reflections 327RST to see the eclipse and want to make sure I am ok towing wise,,, Camper 34 feet long hitch weight from broacher 2130 lbs GVWR 13995 from broacher I remember seeing on the new tag that the camper empty weight a little over 10,000,,,I plan on towing light, so we took her to the scales and this is what the report was. Steer axle 4960, Drive Axle 5880, Trailer Axle 9020, and Gross weight 19860,, that was with a tow vehicle a for F-250 2013 6.7 Super Duty with 3 200 pound guys in it,,, Am I ok?

The capacities sticker in your driver's door jamb on the truck will list the truck GVWR as well as the GAWR for each axle. I'd simply compare your measured axle loads against these GAWR values and your total truck load (4960# + 5880#) against the GVWR. That will tell you what you need to know about the truck.

As for the trailer, it would be nice to have a separate weight for the truck only (loaded with all of you and your stuff) so we could deduce the trailer weight supported by the truck and add that to the weight supported by the trailer axles (9020#). However, assuming the trailer axles support a minimum of 75% of the total trailer weight, it looks like you're probably well under that 13995 GVWR for the trailer. The sticker on the front-left of the trailer should have the actual GVWR and the GAWRs for the trailer so you can confirm your numbers are accurate.

 

[backtrack2015]

I was discussing the apparent disparity between my estimates of front-axle load (due to the trailer pin weight applied at a known distance ahead of the rear axle) and those measured/reported on the forum with a friend.

(For example, having the pin 2" ahead of the rear axle-center should add only 25-50 lbs to the front axle. Measured numbers vary from slightly negative numbers up to a couple hundred pounds.)

Anyway, I guess the way you approach the scales might make a difference here. Rolling onto the scales and stopping without any braking theoretically gives the most accurate answer (and is an impressive feat). If only the trailer brakes are used to stop on the scale, this tends to lift weight off the front axle as the trailer pulls back on the vehicle via the pin. If only the tow vehicle brakes are used, this tends to add weight to the front axle as the trailer pushes forward via the pin.

So disparities in braking force between the vehicles may contribute to variance in the front axle load measured at the scale. I'll admit my impending trip to scale will be the first in 20 years, so I don't recall if the measurement is continuous and averaged for a few seconds or only taken once things have settled.

Anyway I toss this out there for your amusement. I shall be attempting a maximum-g stop using only the trailer brakes.