Mine already had the lift kit installed. The lift kit has no connection with the axle rating. I know at least one member on here who did upgrade his axle.
I started another thread:
http://www.trailmanorowners.com/foru...ad.php?t=18578
I was surprised just how easy it is to overload your trailer with "stuff". When I weighed everything as it came out, it wasn't just one big thing that overloaded our trailer. Now, that was with 3 adults and 2 kids in a 2720, so that is pushing the limits.