I had my floor painted with grey paint, but carpeted it last year. Makes it nice when the car is out as we often use the trailer for a living space at the track. I prefer the wood panel walls. Easy to hang stuff as mentioned, and won't scuff/dent easily like the aluminum interiors.

Here's some toys:

http://www.blazinbelltech.com/

I've bought a few items from these guys as they are right up the road from me in Vegas.