Scissor Jacks like the Leveling Scissor Jack - 24" Lift - 5,000 lbs # JSC-24-IND should be mounted at 90 degrees from the trailer frame rail. This allows you to have full crank handle movement of the Crank Handle for Stromberg Carlson Scissor Jacks and Tongue Jacks # JCH-1. The Ultra-Fab Speed Socket Power Drill Adapter for Scissor Jacks # UF48-979005 is and alternative option. view full answer...
I'd recommend doing one axle at a time. Jack the trailer up by the frame on both sides and then jack the axle up to take the load off of it and then replace the shackles. Trying to do both sides at one time will be hard as the components will most likely have tension in them which will prevent them from from easily being removed and reinstalled. view full answer...
The Electric Ground Control TT Automatic 5-Point Travel Trailer Leveling System - 10,000 lbs # LC672136 can compensate for up to the amount of drop the jacks provide. So while you don't have to be perfectly level, the rear jacks have a maximum of 12 inches of travel while the A-frame jack has 18 inches of travel so this is the amount you can be "out-of-level," as you put it.
Please keep in mind this system is designed to help level trailers at campsites on reasonably level surfaces instead... view full answer...
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