Remember that real bead locks are not leagal for the street, so you would need to have 2 sets of rims and tires if you want to keep your Jepe legal. In this area, I wouldn't worry about it, but I don't know how much I would chance it driving to more distant trails.
I personnaly have been running a 15x8 rim with my 35's and I only popped a bead when I went down to 4 lbs. I typically run 6-8 lbs with no problems. I also have OBA, so I am not too concerned with popping a bead.
Just my 2 cents.