Had a LONG talk with the Lippert engineers during the 2013 Goshen rally about increasing the GVWR of the camper by upgrading the axles.
The upshot was that they WOULD do the upgrade, BUT DID NOT RECOMMEND IT because it would not increase the GVWR.
WORSE YET, it would defeat the purpose of doing it because the heavier axles would reduce my available payload; not increase it.
The reason they stated as that when the GVWR was established, the number was based on the LOWEST RATED component (in my case the frame) and all other components were designed (sized) around that maximum weight.
They said that even IF it was the axles, upgrading them would STILL not increase the GVWR, because they would have no way of knowing where the NEXT domino was without a complete engineering study.
It seems that even the WALLS are built differently in heavier GVWR vehicles (more studs) to account for the additional flexing that would occur with more weight. They said my first warning of a problem could be wall cracks at the corners of the slide-out cut outs.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW