Storage on rear of travel trailer?

As others have indicated, adding weight to the back is the worst scenario.
If you proceed, I would not put anything heavy back there, like water or fire wood.

The way our TT bounces around on the bad roads I would be leery of adding very much on the back no matter how much it was reinforced. How about leaving some of that `stuff' behind?
Do you really need a BBQ with all the accessories and a blue tote and extra water? We carry a plug-in Geo Foreman cooker and use it maybe once in two weeks. Carry the blue tote on the ladder.
But we always stay in campgrounds. BTW five gallons of water is about 40 lbs.

Be careful on adding too much weight to the back end of the tt. You can throw off the balance on the unit when towing and this can add to the unit wanting to sway. If anything you want to be a little nose heavy. I put the spare tire and bike rack on the back but that is it. Also look underneath and see how the unit is built. My old Fleetwood TT was built really chintzy and I wouldn't add anything more than I did with some serious support issues. Good luck.

I did all of this on my TT.

#1 - Reinforce the rear bumper to the frame & add a 2" receiver hitch. Offset the receiver from center to accommodate the spare tire carrier.

#2 - Add a ULTRA FAB spare tire carrier. Move the carrier as far to one side or the other as you can, without obstructing the tail light. This carrier tilts forward. You probably only need the fixed position version.

#3 - Cargo carrier from HF like THIS ONE It Raises the rack higher & not straight out from the receiver.

#4 - If needed, a cargo cover from HF like THIS ONE It's water resistant, not water proof, but does keep out dust, etc.

# 5 - Find plastic storage containers that will fit into the cargo carrier. I got mine from Walmart. 4 of them fit perfectly inside the carrier & inside the cover. Can't remember which ones I got.

#6 - SPARE TIRE COVER