I purchased three of these jacks to raise the back edge of an 8x12 foot shed that I did not intend to unloaded and the extra jack was for safety backup. The center jack managed to lifted the 12 foot shed off the two end jacks simplifying the leveling. Rental jacks started at $8 per day and Internet shopping started around $75 for two ton jacks not including their shipping. These jacks at a total cost of $17 each did the job perfectly.
I bought four of these to replace the aging jacks my 24 foot camper came with. These are way better than I expected for the money. They are very sturdy and not too heavy to carry or store. These screw jacks are also surprisingly easy to crank up or down. Piece of cake as the saying goes. I wish I had of bought these years ago. Excellent value!