If they really have improved welding in recent years, I hate to think what Lippert's welding was like before that. I know that problems with Lippert frames are still occurring and the TT manufacturers and Lippert have not changed anything.
I had a frame & axle shop that is a government designated inspection facility inspect the frame on a previous 2013 TT we owned. They said the welds on the Lippert frame were absolutely terrible. This frame is the one that has I-beams made from 3 pieces of 1/8" mild steel welded together that *looks* like a regular forged I-beam. These allow an excessive amount of side to side movement of the spring hangers which causes metal fatigue in the vertical web of the I-beams right above the spring hanger and other problems from the high amount of frame flex. The frame shop told me it's a case of when you will find frame cracks, not if. As I mentioned previously, this frame can be found on a number of makes and models of ultra-lites.
One problem with frames is the total lack of any codes, standards or regulations for the design and construction of them. No ASME, no SAE, no nothing. No specs or data of any kind on Lippert's website (compare to something like say, Alko's website). Lippert can produce frames however they want without having to answer to anyone. If you are one of the unfortunate ones to have a problem, Lippert tends to blame the owner and you have no recourse of any kind. Unfortunately, Lippert frames are on something like 95% or more of TTs.
When it comes to the more commonplace forged I-beams, some designs are better as they have gussets above the spring hangers and/or 2x2 tubing below the I-beams for re-enforcement. If someone is interested in frames, going to a show is a good idea as you can crawl under all the TTs and see the differences. The fabricated I-beams are easy to spot just by reaching down and running a finger along the I-beam.
mileshuff wrote:
I tend to think there are many many times more Lippert frames on the road than any other brand. The vast majority have no issues. Lippert did take significant steps in improving welds several years ago. My own Winnebago 5'er was made in the old Sunnybrook plant and uses a Lippert frame. Construction appears excellent. No issues.