[double-rr]

Thanks guys.

I like the idea of spot welding the bolt heads so the nuts can be removed from below. I have some thick flat rubber sheet that could be put between the frame and tank. Maybe 1/8" or 1/4" rubber strip the full length on both sides would be enough to allow movement of the tank during flex.

I'll look into the top port fitting from Tanks, Inc. I also have the option of welding the top sump tube in. We have a complete machine shop at work that does aluminum welding and fabrication. Usually cost me a 12 pack of beer for something like that.

I had already planned on an access cover on the trunk tub for the sending unit.