I haven't tried or thought about a wheel spacer. I am not sure it would help or not. My guess is not as it would likley just move the rub over to the mudflap more. Ultimately, after installing the level and alignment, the passenger tire still rubbed. I went ahead and swapped out the 295/70r18 Nittos for 275/70r18 Cooper AT3s. I think the G2s looked better, but no fitment issues with the AT3s and I think they are a little quieter. The warranty and specs were a little better on the Coopers hence the change in brands. I've had the AT3s on past trucks and they seem to be a pretty good tire - so I'm trying to convince myself it was the right move! I had a weekend fishing trip and the return period on the G2s was getting close, so I needed to make a change or live with the rub. Still very odd to me that some trucks seem to fit 34"s or even 35"s while others do not. Looking at some of the specs for level kits on up to 2" - they only recommend 33" tires.