Tonight I discovered the gas tank on my '90 Jimmy is leaking. I spent some time underneath trying to figure out how to remove the skid plate. It appears that the bolts that hold on the skid plate come through the top of the cross member in front of the rear bumper. Since I have a receiver hitch I could only see the bolts on the corners. Are there are more bolts, and does the rear bumper have to be removed? That may be a dumb question, but I'd rather ask now than wish I would have asked after unbolting the bumper and hitch and finding there was an easier way. Thanks for any info.