You didnt mention if the others had also removed their wheels, but if the trailer will be spending the rest of it's days in this spot, blocking it up is a way most stabilize their units, and is worth doing. Some use stabilizing jacks for this so any future settling can be compensated for easily.
You can also put skirting around the bottom to keep most debris from blowing under it. That won't help much for critters that would want to take up residence under there but it will slow them down.
Dan & Loretta, US Army Retired Aero Scout Pilot
2012 Fleetwood Providence 42P Class A/DP
Spartan Chassis, 8.9L Cummins 450HP