Testing the travel extents of my own build, I know my 35s will tuck up into the fender at least 1" if not 1.5" at stuff. It's part of the reason I'm an advocate for +35mm offsets as anything less with wide meats will eat fender.
For a 37", keeping to +35mm offset and tire within the fender may not be as balanced or desirable. Being 1" taller in radius, + the 1.5" at full stuff, and that's 2.5" of additional fender clearance needed. Then add in the potential for adding Tundra long travel, and that's possibly 3"+ of fender fender clearance. It's no surprise and I half expected the Steller Built rig to eat fender.
Part of a layered recipe to create clearance for 37s in my mind is to body lift 1", bias travel downward and limit up travel by 1", and 1" fender trim.
Expanding on @grinchy body mount question, there's some nuance to caster. Utilizing a caster corrected UCA will bring the centerline of the tire closer towards the body mount, making things tougher to clear. Caster is necessary too so it'll be a balance of concerns. Anything up to about a 1.75" sensor lift can still utilize stock UCA caster geometry to maximize clearance. Offset will play into this too, with more swinging with lower offset. I think the Tundra arm can help.