Before investing a lot of money, I suggest borrowing a friends between-the-tire wheel chock
to see how much movement is reduced. They sell new for about $45 each if you decide to buy one. I have used one and it does dramatically reduce trailer movement.
I realize I did not answer your question directly, so here is my opinion. any "jack" will not eliminate front to back movement. The expensive stabilizer systems do what they claim, but the cost is a consideration.
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"