Not sure about quality difference. Not sure what would be diffirent interior wise other than floor and wall construction. Hemisphere would be the light weight model with aluminum frame and fiberglass exterior vs the wood frame and aluminum exterior of the Salem.
2013 Salem 30KQBSS TT
Equalizer 4pt Hitch system-12K
2016 Ram 1500 Crew Cab Sport 5.7 Hemi w/8 Speed