I installed mine in our 400 in the storage area with the outside hatch behind the axle (both the box and display). It is easy to get access to see the display when needed of check out the inside of the box.
When I took my Tab to a local rv dealer of Tabs and airstreams, for the change out at almost $500 for 5 gal and 2 hrs labor, they were able to do this work because the Airstream which they service, uses the same Alde system. they have only 1 person experienced and the pump system to do this work. it is crazy but at least I had someone near by, next near place is almost 3 hrs away.
Found these grey baskets at Walmart for about $6 each. They happen to match the grey cushions AND fit perfectly on the new shelf. The shelf gets removed during transit. It has three braces underneath for added support while at the campsite. VERY easy to install by just tightening three screws a few turns. Very happy with this new find. Looks good, inexpensive and fits the space. Gonna go buy a lottery ticket now.
Nice job. I also mount the 8 gallon action packers on the platform of my 2021 400. They work great. I bought all the hardware to bolt them down then ended up just using a ratchet strap as I realized I like to remove the often for loading and moving them around camp.
I attached the camera above the license plate on the aluminum cage. I made a little angle bracket for the camera to sit on. Ran the wire behind the cage and through the trim above the running light.