I looked at a Heritage trailer this winter and decided not to buy it because of the "vault" system. The selling dealer told me it is exclusive to Heritage, and Heritage or their dealers are the only sources for parts/service. While the 10-year warranty sounds nice, it doesn't mean the system won't fail--it just means Heritage will fix it if it does. If the system fails at 10 pm on the highway, that creates all sorts of other issues.
Instead, we went with a Load-Rite that has the sure lube system as well. Our previous trailer was a Karavan, which also had sure-lube hubs, and I never had a problem with them--but I maintained them regularly.
To me, the words "no maintenance" and "trailer wheel bearings" should never go together. Like a lot of forum members here, I take the time to maintain my trailer wheel bearings in my garage, before something happens...….no matter how much my wife teases me about it. :joyous:
Bottom line, if it were my trailer, I'd see about converting it to a system that is user-serviceable and for which parts are readily available.
