Joe -
We have the Dirt Devil and are quite happy with it. Yes, it was Keystone installed and came with the Alpine, but it is still a good unit. We use the Dirt Devil at home, so makes sense . . .
I don't know the internal layout of your RV, but I can tell you one item about the RV Dirt Devil. It is LOUD! You will not want to mount the central unit inside the living space, and if you do, get some ear protection!
As you are installing it yourself, you will probably do this anyway, but . . . Make sure all the hose connections are tight. The hose connection for the living space of our Alpine came off sometime between build and first use. I took the plate off, retrieved the hose, put it back on the plate, and used a little foil furnace tape to secure it. That should take care of it for the next million years!
Ron
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2011 Alpine 3640RL (Beauty)
(Gone! Now replaced by Beauty3)
2016 Ford F-450 (The Beast)
Diesel 4x4, DRW, LB, CC
Comfort Ride Hitch