GTWR & GVWR???

I doubt very much that anything catastrophic will happen, maybe just a little extra wear and tear on the TV. :)

However I believe you have a valid concern with your tires. I blew 2 Carlisle ST tires with less than 2 years and 8,000 miles on them. Look at replacing your ST tires with LT tires if it is possible with your weight and axle rating, when you change tires.

fj12 - I've done the math, looked at the differences in 1 ton vs. 3/4 ton SRW trucks, asked for and got good feedback from everyone from my original post. To me it comes down to what do you feel safe with on the road with your most prized possession's (family) sitting in the cab with you on trips to go have some family fun. With that said, I wish when I was originally buying my truck to tow the 5,000# bumper pull trailer that I had at the time, that I would have gone ahead and bought a 1 ton SRW. I never thought about buying the 5th wheel I now have until I saw it at the Spring RV show in SLC. My hindsight is 20/20. If I was full timing it, I would own at the very minimum a 1 ton DRW. We go out about once every 2 - 3 weeks during the season and mostly for the weekend. We are blessed here in UT with an abundance of camping options that are within an hour to 4 hours away which is great for the long weekend trips we like to do. Thanks for your input. I don't disagree with anything you or any of the other responders have posted. Honestly, I am more worried about the Towmax tires that came on the Spartan than my trucks ability to handle the load going down the road. I will address that issue in the near future!

Well, you finally got someone to agree with you that you're fine. It just took a couple pages. :)

caberto - The tires that I have on the truck now are each rated for 3640#. I agree with you, I should be fine with my set up so long as I don't load it up with to much water & gas while going down the highway @ 65 mph.

I doubt very much you're over your actual rear axle's weight limit... most 3/4 and 1 ton SRW axles are rated for at least 11000 lbs now. What limits the RAWR on pickups is the rear tires' load rating (3/4 and 1 ton SRW usually share the same axle, as well as the frame and brakes, they are usually differentiated by an extra leaf spring and higher load rated tires).
Stock tires on 3/4 ton trucks usually are rated for around 3050 lbs, thus the GMC Rear Axle Weight Rating of 6100 lbs or so. If your tires are replaced with higher rated tires, your RAWR (unofficially - because the factory sticker is based on the stock tires the factory installed) also goes up because it's still well within your actual rear axle rating.

I can't tell you it's OK or it's not OK, but most of the 1 ton trucks with higher GVWR are the same truck as a 3/4 ton, except for the tires and perhaps an extra leaf spring, which you can add air bags if your truck sags, as that is all the extra leaf spring would prevent as well, but that won't increase your RAWR, as neither will an extra leaf spring, if your tires are still the limiting factor.

This is not a cover-all post that suggests it encompasses all trucks and all situations... so you need to do some research on your particular situation.

mackyb wrote:
I should be lighter on drive axle weight once the rear of trailer is loaded with 4 wheeler and other stored items we normally bring with us.

I believe you received some excellent feedback and now should have a good understanding on weights.

After you re-weigh it fully loaded, let us know how it worked out.

I should be lighter on drive axle weight once the rear of trailer is loaded with 4 wheeler and other stored items we normally bring with us.

mackyb wrote:
fj12 - Maybe I'm missing something here. GMC's certified drive axle rating is 6200#. My truck scaled @ 3560#. The rear axle is well within it's limits!

as others have said, you posted

"Scaled Weights of truck & trailer combined: 21,920# gross weight, steer axle = 4800#, drive axle = 6400#,"

that 6400 is greater that the rated 6200 max allowed EVER for your truck.

laknox wrote:

hmknightnc wrote:

mackyb wrote:
fj12 - Maybe I'm missing something here. GMC's certified drive axle rating is 6200#. My truck scaled @ 3560#. The rear axle is well within it's limits!

According to your Post your loaded rear axle is 6400# and rating is 6200#. That's overloaded and in violation of DOT requirements (axles and tires must be within ratings when loaded). I am sure your Duramax (I have a 2015) pulls it fine but your 3/4 ton suspension isn't built for that load. Good luck

X2! You're 200 lbs OVER your RAWR, with a mild load on your FW. That being said, if you have a load in the garage and a full fuel load in the gas tank, you might be decreasing this due to the fact that it's all behind the axle and will counter-weight the pin. Were it me, I'd be storing =everything= I could in the garage, as far back as possible, especially when no toys are loaded. Carry =nothing= in the truck, 'cept people and dogs. Very, very marginal, IMO.

Lyle

X2

We tow over GVWR, but under both axle and tire ratings. I am not sure I would I would like to be scaled some where and be over the axle rating.

hmknightnc wrote:

mackyb wrote:
fj12 - Maybe I'm missing something here. GMC's certified drive axle rating is 6200#. My truck scaled @ 3560#. The rear axle is well within it's limits!

According to your Post your loaded rear axle is 6400# and rating is 6200#. That's overloaded and in violation of DOT requirements (axles and tires must be within ratings when loaded). I am sure your Duramax (I have a 2015) pulls it fine but your 3/4 ton suspension isn't built for that load. Good luck

X2! You're 200 lbs OVER your RAWR, with a mild load on your FW. That being said, if you have a load in the garage and a full fuel load in the gas tank, you might be decreasing this due to the fact that it's all behind the axle and will counter-weight the pin. Were it me, I'd be storing =everything= I could in the garage, as far back as possible, especially when no toys are loaded. Carry =nothing= in the truck, 'cept people and dogs. Very, very marginal, IMO.

Lyle