I asked some of my West Coast off-roader associates (deserts, dunes, fire roads, mountain trails, etc.- not rock crawling, not mud bogging) that are familiar with tire size and gearing stuff what they thought and the answers were fairly mixed.
They said, basically,:
3.42:1 gears and 35" tires, towing heavy or not, on an '18 is fine according to them- you'll forget you upgraded the day you put them on.
3.42:1 gears and 37" tires withOUT towing heavy was split. Some say you can get by fine with the 3.42:1 gears, depending on your preferences. Most said at the very least swapping to 3.73:1 gears would be preferred, 4.10:1 gears would be ideal.
3.42:1 gears, 37" tires, AND towing heavy was a consensus that swapping to 4.10:1 or 4.30:1 would be a must.
I know you only asked about 35" tires, but I thought I'd give their full options just in case (I asked about 3.42:1 gears and 37's myself). Just some food for thought:Cheer:.