I put cross braces across the door tops, with a central brace between the two braces. I used a come-along to a rafter to lift the tub off/on to the frame. Since I was doing this in half my garage (alone), each time I needed to work on the chassis or tub, I pulled the tub off. I used some 6" to 9" threaded rods into the mounts to make dropping it back onto the frame easier and got to where I could get it off and/or on in less than 30min. To work on the underside, I simply held one side of the tub up, while I lowered the tub onto some tires lying on the floor. I don't know the weight, but a completely stripped tub is light enough to hold with one hand while working the come-along with the other. -It's too bulky to try to lift, but it's really not that heavy. I was more worried about denting/bending the new rockers, or other body panels than weight. I supported the tub with 3 wooden bar stools while painting the underside or when welding in the new battery box.