One of the things I like about having a smooth fiberglass interior(Burro), is I can experiment with modifications just using Velcro and suction cups to decide if the prototype suits my needs.
For example, I hung a sailboat style hammock/storage net from 2 suction cups, wondering if I’d use the extra space. After a couple of trips it was really handy, so I left the suction cups up with the storage hammock- they are really strong.
Made a counter extension out of the stove cover by putting some Velcro next to the stove top, moved the plywood rectangular box(stove cover) to the right, with Velcro on the bottom edge. Made a leg to support the free end, attached with Velcro to the inside edge, and a square of Velcro on the bottom.
Great shelf- counter space, and now I have a place to put the stove cover when I need the stove.
No end to simple little add ones with Velcro and suction cups, and no holes drilled.
Velcro sticks to the carpet roof to hang solar
lights- probably all knew that.