Part of the reason I made a low profile roof rack is it gave me about 3" clearance from the open garage door. I found out when we replaced the doors the openings are not standard, but about 4" taller than standard. The door guys asked if I wanted to lower the door height, or put a spacer along the bottom of the doors. I took the second option.
Brian. I also thought about welding a ramp onto the front of the hangers, but it would have covered the OEM tow points, and a lot of tow companies will not tow it without them. And, I have had to have it towed more than a few times...
The cross member must be above the gas tank, maybe its what the tank mounts onto. I never really looked. When I did the SAS and removed the shock/coil towers, I cut the rivet heads off with a torch and knocked them out with a punch. It went real easy. Don't think I would want to do that with the gas tank right there, welding in that area makes me nervous enough, even with a piece of scrap metal shoved between the tank and frame. Someday, I need to pull the gas tank skid plate and straighten it out. The bend in it pushed up on the tank its a gallon or two short on capacity.