Welcome to the forum
Sorry your first post has to be a negative one. If rollers were installed that lifted the room 3/8" off the floor, then I would say they were installed wrong or the wrong rollers were used. Make sure you DOCUMENT everything. Take pictures and talk to Keystone again. Explain the issue with pictures and be sure to tell them how the floor sat BEFORE the rollers. I cant buy the "its normal after rollers" explanation.
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.