Lummy,
Thinking out loud for a bit, your problem is that the scissors jacks on the rear of your trailer hang down too far and will not clear some "inclines" when backing.
You are looking for a "REMOVEABLE" scissors jack that you can take off for towing and put on when parked.
First, any "removeable scissors jack" will need to be "tightened securely to prevent wobble" or it simply won't offer any stabilization. That means an extended time under your trailer with wrenches to install and secure the jacks, even when setting up in muddy or rainy campground sites... NOT A FUN PROPOSITION !!!!!
Have you considered the telescoping stabilizers rather than the crank down sicssors stabilizers ??? The retract higher than the scissors jacks and give a bit more road clearance. Also, if you purchase the correct type, they will span the frame rails, so you can move them forward slightly to gain even more "tire to bumper clearance". (you can do the same with scissors jacks, but need to locate a mounting position that has a pad on it).
BAL has one type telescoping stabilizer system that will probably give you more road clearance than most scissors jacks.
https://balrvproducts.com/products/#jacksstability