Extra Load Rating Tires For 3500

[northernlite]

I'm looking to swap wheels and tires to increase the load rating - short of going to 19.5" wheel/tire combo. I carry a camper and am at max tire load weight on one rear tire (due to camper loading). I wanted some buffer.

I have LT265/70R-17, 3195 lbs max load.

 

I see the 2011 3500 SRW have LT265/70R-18 with 3525 lbs max. No luck with dealer in trying to purchase that tire/wheel set.

 

There also is a LT285/65R-18 with a 3640 lbs max. The overall diameter of both are just under an inch bigger than stock so I believe they should fit the wheel wells.

 

Any one have any ideas on either sourcing the 18" GM wheels or other 18" wheels that would work & comments on sizing?

Thanks

 

2009 3500 SRW D/A