Go to home depot and get a Ryobi 18volt lithium battery impact driver for 99,00/
Use it all the time, We had a 30 class A that had no jacks, trying to keep the MH from rocking when walking was a real issue with the light sleepers inside. Bought the largest scissor jacks we could find and welded then onto the frame.
I would take the impact wrench (not a drill) and used the speed socket that I bought from CW to extend the jacks down to the point of lifting the wheel into the air, a lot easier than the hand crank
Copy this link and paste it into you address window
http://www.homedepot.com/p/Ryobi-18-Volt-One-Lithium-Ion-Drill-and-Impact-Driver-Combo-Kit-2-Tool-P882/203406854?N=5yc1vZc298
Get 2 for 99.00, I've used these tools in commercial construction for years, they have held up well.
