Do you think that it would be safe to carry a 33x12.5 on the stock tire carrier if I were to back the tire carrier brackets up on the inside of the tub with 3/8" thick steel plate and bolt all the way through everything? I was thinking of some plate about 2"x 3" or whatever will fit.
2004 Rubicon, 6" lift, 35s, winch, hard top, full doors, bumpers, tire carrier and rock sliders.
Larger inside plates would be good insurance. Also check any points of freeplay. After all these years, your holes for the latch and swing pivot points should be ovaled a bit. These could be addressed by slightly larger bolts or drilling out the oval holes to slightly larges ones the accept brass bushings with the bolts going through. It's hard to explain it, but a rattling, loose rack will end up tight and like new. Some of my CJ buddies run 33 inch spares on a stock rack and it is fine unless the rear of the Jeep smacks down hard on something.....then it's rip city!
I never did it, I have a bumer-mounted unit, but I once got to thinking . . .
For the top two backing plates, why not make kind of an "L" bracket, so that it can also be bolted thru the top of the wheelwell? You could make it snug under the lip inside the tub, not very intrusive, I think. I like the idea of some of the weight being x-fered down onto a horizontal surface, better able to cope with the weight.
By the by, I think that the Bestop TJ tire carrier does something like this.
__________________ '82 Scrambler - NV4500/4.5" lift/33" Toyo MTs/4.0/twin stick, and my windshield washers work! Full 1/2 cab Cage
2004 Grand Limited 4.7 HO - OH Boy!
2010 Grand Laredo 5.7 Hemi - SICK - work vehicle -gone - replaced by an 08 Tahoe - nice ride.
"Both my Doberman and my Jeep can accurately be described as 'black and rust.'"
"I got a fever . . . and the only prescription is more cowbell"
I would think if the "L" bracket also tied into the 2 bolts on the roll bar you would gain quite a bit of stength..........
1979 CJ7 (YJ tub) full cage, Currie 9inch rear with Warn full float kit, detroit locker, 456 gears both ends, Lockrite in front, T 18 trans, 360, 040 over, Isky cam, 2 into 1 Flowmaster exhaust
I'm not as good as I once was....but I'm good once as I ever was.