I single handedly removed, lowered for fit and then finally mounted it on one inch blocks. I screwed four heavy "eye" lag bolts into my 2 x 8 my garage rafter joists. Then I used flap style cargo straps to hoist the tub one corner at a time. I could even pull it to a 45 degree nose up angle with this method.
Two straps went into the top holes of my windshield hinges and the other two went onto bolts and washers screwed into my CJ-7 tub's tailgate cable brackets.
Here's a pic ...
http://www.monsterslayer.com/jeep/images/UnderTub.JPG

JAF