Finally getting a camper!

Get a couple of pieces of 2x6 or 2x8 to level the trailer side to side if necessary. A chunk of 4x4 will save you some cranking when unhooking. (Obviously there's more sophisticated blocking systems.) Have a heavy duty extension cord in case you can't get close to the electric hookup. Get a couple of wheel blocks to prevent the camper from moving (the tongue jack won't do it by itself). There's lots of info on carrying firearms. Putting the unloaded gun in the trailer and the ammo in the tow vehicle satisfies most of them. Park Rangers have stopped me an asked if I had a firearm. Your unit is large for a popup so what's OK for folks with a 10' box may not be OK for you. As large as your unit is you need to stabilize the front corners too (surely the rear has them). If not already mounted get a couple of screw jacks or bottle jacks to do the job.