I have no idea what the requirements might be for +/- on wheel offset, but I bought mine with 20" Torque Thrust wheels already on it.
The tires were pretty low profile, though...
They were 285/50 R20 Yokohama Parada all-season sport treads.
The fit in the wheel wells with no lift. Tough to slip fingers in front or back near the fender. It was pretty tight on front and back sides. Top had enough clearance for street driving. Not sure how it would have done trying to flex on a trail. My guess is that tires would probably get sliced up on on the fenders a really rough trail without making extra clearance around the wheel openings or adding suspension lift of 2-3".
Wheel offset will determine how much they will rub when the steering wheel is turned in tight turns. I had no spacers on the hubs (not sure I would want them anyway), so mine did rub a little on really hard cuts on the steering wheel. I soon learned how much I could crank the wheels in tight parking lot or U-turns. I just stopped turning that hard to avoid tire scrubs on the frame.
The bigger rims did look sporty and cool. Torque Thrust were some nice rims for sure.
The 285/50 R20 tires just had too little sidewall and the sport street tread in that width was just too slick for my taste, having to drive in sloppy New England winters. I eventually went back to the Z71 stock 265/70 R17. Better wet and winter traction with all-terrains in this narrower width. Wide sport treads are like sliding on banana peels on wet/slushy/snowy roads. Also... our famous pothole season is like 9 months out of the year, so for me having nice fat sidewalls to soak up the kidney-busting craters is more important than having sleek sporty low profiles on there!