Retired_jim,
We have the SteadyFast trailer stabilizer system. It is like the JR Strongarm system. Secure the bars front and back for added stability.
Installed it myself over a weekend. Instruction are very through and easy to understand. It works well for us.
We have the electric package on our Passport. Jacks are scissor-like and do not fully extend when campground pad is inclined from front-to-back, The stabilizing system provides 80% stability. On totally flat camp pads, stability is 100%.
We are impressed with their customer service. They gave us an extra stabilizer shoe when the packaged one had "bubbles" from the paint job and the owner is reachable by cellphone.
Website is:
http://www.steadyfast.com.
JW