Hi! I don't know if I'm in the right place or not. Guess I'll find out. I have a 2005 chevy 3500 dully, Durmax, Allison, crewcab, LWB 4x4 LTZ , etc.It has LT235 85R 16 ms rated stock tires on it. They look like traineing wheels. I'm looking to replace them and would like to go with a bigger tire. Not "real" big, maby a couple sizes with a little better traction capeability. What is a good size and will I need spacers./ Also will spacers effect my load capisity/ I tow a 35' 5th wheel. Aprox 16,000lb. Hope someone can advise me.