I agree on getting rid of the Harris Batteries...mine only lasted 5 months, followed by much finger pointing with Harris flat out denying warranty on their batteries in a Thor product blaming the WFCO charger, with WFCO blaming Harris Batteries, Thor pointing out they do not warranty batteries and CW (dealership) saying not their problem. Bottom line: I had to pay for two new batteries after 5 months. See thread elsewhere this site for the whole story.
Check fit and trim of parts. Take drawers out and look for sawdust, screws, and such under and behind things.
Sheree & Michael NCNG LTC(ret) with Munpi, RC and Sheba (cat).
2019 Nexus Viper 27V, E-450, 5 speed "Ms. Enterprise", Infotainment Center, HUD, , Safe-T-Plus, Curt SpareTire Mount, ext. WiFi Antenna, Roadmaster Tow Sys& Invisibrake.