p275-16s are near the limit. You'll have to gear down your front and rear diff, otherwise the big tires will bog you down on the highway.
235/75/15 is the biggest that will fit with no lift not true my stock 94 geo tracker has 255/70/15 and drives just fine
OEM size is 225/75-16 Largest tire you should install with modifications is 245/70-16
The largest tire size that can fit on a 2006 Ford F2 50 crew cab, without needing a list, is a 275 R 95 22. Any tire larger than this will need a lift kit.
285/70/16 without any lift changes!
195/75/R15
P205-75-15
A Ford F-250 can come in a variety of tire sizes with or without being lifted. The largest tire you can use without having to lift the truck would be 265/70/16.
Tire size is dependent on wheel size and clearence under the fender the grand cherokee has 16 inch wheels standard 245/70r16 is the largest tire that will fit under the stock hieght fenders if you want to use bigger tires you must lift the body to allow for clearence
33's no lift
31 inch
depends on if you want a tall skinny tire or a wide mudder type, my suggestion is find a tire shop willing to work with you and put the largest size he suggests on the front and check for turning clearance the wider tires will hi sooner then the narrower ones also under the truck there's torsion bars that can be cranked in and this will raise the truck some
235 70 r16