If you ever visit any of the Elkhart or Goshen manufacturers you will see that they store all the major components just laying in the parking lots totally unprotected from the elements. Any trailer built between say late October and March will arrive with rusted suspension springs and shackles. Most rust will be the iron propane main pipe.
When I asked Forest River about rusty trailers being delivered, their official response is we DO NOT warranty for rust. The 3rd party pipe manufacturer does NOT powdercoat that pipe. They suggest that after delivery, the new owner or the delivery dealer should treat for rust as part of the owners maintenance.
Basically, rust on a new Forest River unit at delivery is to be expected when units are built in the winter. This is not a lie, check any winter built unit youself.
2016 Wildcat 295RSX - 2015 GMC 2500HD DblCab Duramax/Allison 4x4 Z71 6.6' Bed
Maxxis 16" E; Ride Rite AirBags w/AirLift 1 wireless compr; Adv.Folding 4 Cover
Andersen Ultimate II Aluminum 5erhitch on Reese Flipball w/Curt 4" offset ball
LCI Ground Control 3.0 4pt + 2pt Elec.Rear stabilizers; 3 Slidecovers; 10ft. Portabote
6000# Dexters; mor/Ryde CRE3000 w/HD Wetbolts; King Dish Tailgater; 5hp Outboard
Dual A/C; Furrion 48 Rear Camera; Champion 3100 Inverter w/Extended Run