I have the 45 series tire as well with the kit tony showed you and I have never rubbed while towing. My tires are just slightly more narrow than yours. As for the grille I had it painted before but it kept chipping so I removed it and used plasti dip. It's real easy to remove, if you have any questions just let me know. It's held up real well even thru washing it with a pressure washer. No chips yet. The only down side is it isn't glossy like paint. Plasti dip will give you matte finish. But I don't mind it one bit.
Kool well can you tell me exactly how you took that grille guard off please. Project for this weekend.