Our 5er came with 2 capacity c series jacks on rear. Are these better than the scissor jacks I also would like to add 2 more jacks just in front of tires. Would scissors work ok there
Our first trailer had that single leg system. I never could get it to feel really solid.
Replaced with a pair of scissors from CW. That lets you tweak the pressure on each side if necessary.
Extra jacks won't hurt anything, but you may be disappointed with the small measure of additional stability they provide. You won't get rock solid unless you get ALL weight off of the wheels/suspension.