I want to mount my spare tire inside my '90 Suburban. It's a 42" TSL on a Hummer beadlock and it weighs about 180lbs. I don't think mounting it straight to the bed floor will be strong enough unless I use a big plate underneath floor. I was thinking something about 6" square and 1/8" thick. I don't want to mount it to the roof because it's tall enough and I don't want to hang it off the rear because it's got enough rear overhang. So what suggestions do you have?