Re: Wheel swap question
Stock tires are 31.6" tall and the 305 tires you mentioned are 32.8" tall. With some offset wheels they should fit; so the tire doesn't rub the frame when you turn the wheel (lock-to-lock). Make sure that the smaller 16" wheels you get will fit over the brake calipers.
Your bolt pattern is 5-135mm, not sure of the lug thickness though.
Also of note: 305/40R22 tires are also the same diameter as stock and are the width you're after. The 305/70R16's may not rub with standard wheel fitment providing the 16's can fit over the brakes. Good luck!
'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!