The large number of failures I see attributed to things made by Lippert Components certainly gives me pause. As do the serious types of failures I see described. However, just the fact that they supply so many RV manufacturers with so many different components could lead to a highly visible volume of problem reports.
Lippert continues to gobble up competitors. Jayco used a small company to build its trailer frames, but they got bought up by Dexter Axle. Then Dexter decided to concentrate on their core business, so sold the frame unit to Lippert and now Jaycos have Lippert frames. Jayco specs the size, weight capacity and type of frame desired, but they don't "design" it - Lippert's engineers do that. And then Lippert's factories fabricate the frame to the design once Jayco accepts it.
Al-Ko is a major axle, brake & slide mechanism supplier and also a major frame builder in its home European market. They are looking to expand their US market share, so maybe we will see more trailers with Al-Ko frames in the future.