I have seen the 3M command strips used alot in the trailers.
I have also seen the other method used by mounting the nice made up coat rack holders with a top shelf and holding them in place with the MOLY BOLTS where it looks something like this google image...
These looked pretty nice to meet the different decor of the trailers...
This is what a MOLLY BOLT looks likes and spreads out behind the thin walls giving alot of support for heavy items...
Different things for different folks I guess...
Roy Ken