new sierra 2500HD

I have 20" wheels on mine (4x2) and the front of the RV is not too high. If you need extra drop get the proper draw bar for the task.

Welcome and congrats on the new truck!!!

As for "making your trailer to high", do you mean the tongue of the trailer? If so, does your weight distribution (wd) hitch have adjustable height? The hitch head (part ball mounts to) would be botled to the shank (part that slides into truck receiver). If so, just adjust the head down to level the trailer out.

It is possible you may need a different shank that allows the head to be dropped more. Available at your local hitch/ rv dealer or online from places like etrailer.com. A new shank can be $100-$150 depending the size "drop" you need. One thing to consider if you need a new shank, get a 2.5" shank so you don't need the adapter to fit a 2" shank.

As for the 20" rims, they are basically the same overall height as the 18", and probably the 17" as well. I know because I am seriously considering changing to the factory 18" rims for a better tire selection compared to what is available in the 20" all terrain type tires.

I hate to think of 20" tires. the cost is about double of 15" tires to replace.

Depends on the tires you get. I recently replaced my 20" tires and they cost little more than the standard 17" ones that come with my truck. Can't imagine tires for 15" wheels and cornering. :)

old guy wrote:
I hate to think of 20" tires. the cost is about double of 15" tires to replace.

Depends on the tire you are looking for. Stock replacement for my '13 (probably the same as the op's) I think was about $170 from the Tire Rack. Now if you want an AT style tire, it is stupid for a LR E!!!! About $300/tire!!! And there is only 1, a Goodyear All Terrain Adventure model! So that gives us 2500HD owners rolling on 20's 2 tire choices from what I have found!!! (end rant-sorry op!!!)

Wmoses, did you stay with a P-rated tire, or step up to a LR C? It helps you have a 1500 with tire selection.

The 20" Michelin's for my old Sierra were $250 each.

P-rated tire. Works well for me. Is more than enough for my axle rating, gives a nice ride and works great with my RV.

I forgot to mention that I have a 5th wheel 06 sierra three slides thanks

I'm going to say that when you put that trailer on your truck it's going to bring it down where it what's to be.;)

The new truks sit higher in the back due to the higher bed rails on the newer body style. Has nothing to do with 20" wheel option. Overall tire diamater is still the same whether you have 17, 18, or 20" wheels. 15" wheels aren't even an option with the size of hte brakes on the new trucks. Shoot I can't recall seeing a new truck offered with 15" wheels in well over 10yrs. Do they even still make 15" tires??? If you decide you don't like the 20" rims I am sure there are plenty over at the Duramax forum that would be willing to trade you their 18" rims.