Michael, you might also consider the Bigfoot levelers. Their web site is
here.
I had these on a previous class "C" and they worked very well. They might be a little easier for an after market install since they have individual pumps on each leg and don't require running hydralic lines to all 4 corners of the RV.
This is not to say there's anything wrong with HWH. I have them on my unit. Camping World sells and installs HWH. I see you're in MT and probably don't have a CW nearby, but if you take a trip out to Seattle or down to SLC you'll find CW there. Got a flyer from them yesterday and they're offering free install in HWH right now. Good luck...