For the tongue I use 4 4x4 blocks 12" long. I lay 2 side by side, then two more side by side on top of those then center the foot on them. Very stable. I carry a couple 2X8x24 and1x6x12 for leveling, then the stabs have plastic stackers. As someone else posted, I keep the jack and leveler stuff on the street side, but store my X Chocks and stackers in the rear storage along with the propane bottles for the grills and the sewage hoses, and any other chemicals used. Heavy stuff up front, light stuff in the rear. The sewage hoses/fittings/water hose are kept in a plastic bin, and the large pads fit 2 on top, and top behind that bin, then everything else stacks in nice and neat.
I got a new bracket for the trailer that bolts to the A frame and stores the hitch head and tension bars, so one less item in the storage, and I plan to slowly replace the wood with more leveling blocks, though the wood has worked out very well since it is long enough for both wheels to rest on one board.
At home I have patio blocks laid out so I park the trailer over them and keep everything stored inside. Even have the 4x4 already in position, so just back it in and drop it.