[JRTJH]

The first statement is, "It's going to be parked permanently" then the last statement is, "but not moved much"...

If it's going to be parked permanently, put it on concrete pillars (Lowe's or HD) and permanently skirt it with plastic "mobile home skirting"...

If it's "not moved much" then consider buying a set of adjustable RV "screw jacks" and supplement the existing stabilizers, keep the tires covered and aired up to maximum recommended pressure. Develop a temporary skirting, something like vinyl tarp material that snaps onto the J-wrap and is held in place with sand bags or other weights so it won't blow with the wind.