DRV will void the warranty on the frame but the one year warranty is hardly worth having IMO. DRV will work with you on strengthening the frame but Lippert will not warranty it. Overbilt lifts, which supplies the lift for Blue Ox, will install it on the DRV and considers the DRV frame as strong as any he has worked on. I went with the HydraLift. My bike is about 600 lbs.
My DRV Mobile Suites with the HydraLift

New Horizons will install a HydraLift on their coach and Excel will on their shorter models.
Here is the HydraLift on a New Horizons
