My Alpenlite rides on a Lippert frame. Over the years some serious upgrades have been done to compensate for the deficiencies starting with the areas around the spring hangers which have been boxed in properly rather than have a simple gusset. Next came the upgrade in springs, going from a 6 to 7 leaf stack. Also installed the Equaflex centerpoint system & the alignment system.
No problem with the bearings. Trailer has the Nev R Lube bearings. Must be the better part of 100,000 miles on the trailer so it has had more than average of best & worst that the roads can give it.
The only addition that is non Lippert is the 5th Airborne air pin box. Don't like it. Better than nothing but nowhere near as effective as the Lippert airbag pin box. Huge difference in travel difference between the two. Had the Lippert pin box on previous near identical trailer.