We recently bought a 30’ ultra lite. It has power stab jacks for stabilizing but there is a lot of floor bounce even with heavy duty metal “between the tires” expandable chocks. I believe my best shot at getting rid of the floor bounce is supports or jacks mounted fore and aft of all 4 tires. I can pick some flip down tent trailer jacks up for $30 all four off craigslist. Do you think these would do the trick. They appear to be adjustable.
2019 Rockwood 2608BS 2018 Ford F250 6.7 diesel 2006 Fish Rite 18' Yamaha 115 and T8
Like these: https://www.ebay.com/itm/Trailer-Jack-Stand-Pair-Set-Rv-Stands-Travel-Heavy-Duty-Adjustable-Combo-Kit-/153001350532
Six of those would be good. One placed near each useless power jack and one just in front of each front tire. Of course you could use six scissors jacks and sell the power jacks to some unsuspecting party on Craigslist.
On our TT we used the Jack stands like are used on mobile homes. They would make our TT rock solid when I put them under the frame. Drop the front of the trailer place the rear jack stands and then raise the front just a little past level and place the two front jack stands and then lower the front onto the jack stands.
Like these: https://www.ebay.com/itm/Trailer-Jack-Stand-Pair-Set-Rv-Stands-Travel-Heavy-Duty-Adjustable-Combo-Kit-/153001350532