Max zilla size

I have a g2 outlander. I was wondering the max zilla size I can go. I hear I can fit up to 29’s. I can trim the plastics if I need to. That part doesn’t bother me at all. It is stock size with gp shocks. The only thing Im worried about are my shock reservoirs, with the stock tires I hit my reservoirs a couple times until I cranked up the preload more. I can crank up the preload more to keep from that happening but I dont want it riding like a tank. Im just wondering tire size for now so I can then decide on wheel size. Thanks for the help.