My last two fifth wheels have had only 2" between tires, and tires are the size on the sticker (OEM size). Never been a problem, just can't move up in size.
__________________
Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD Duramax
Reese Fifth Airborne Sidewinder