If you have the aluminum alloys, they are 16x8. A 33x12. 50x16 will fit on the wheel, but the sidewalls will be rolled in a bit. The only reason that may be an issue is if you tow heavy, the high air pressure will cause much more wear in the center of the tire tread. Watch the air pressure and try to get the tire to run as flat as possible on the road.
A 285-75x16 is really close to the same height with a little less tread width, a 235-85x16 is pretty close height but quite a bit narrower tread. Personal preference from there!!