If you read all of the posts about this in this and Sandpiper forum, you will see that not all the units are really heavy. It depends on the options that each unit has. As far as the axles, try getting your dealer involved. If they won't, then you can do it yourself for under $2500. Buy the axles direct, or have a dealer order them for you, then go to Tredit Tire - Tires and Wheels for RVs and Trailers
and buy you 5 wheels and then switch your tires to the new wheels. You will save quite a bit off of the $2500 in travel expenses. Funny thing, at my dealer the other day and my salesman asked me did I see anything funny with the newest Sandpiper they had on the lot....I noticed immediately that it had 7k axles under it!!
2012 Sandpiper 365SAQ weighing @ 15k, Onan, 2nd air, slide toppers, TST
2013 F350 6.7L Lariat 4x4 CC DRW,Viair 1007, Ride-Rites, Edge CTS, B&W
2001 Chevy 3500CC DRW 4x4, 8.1L, 4.10 gears w/ Detroit TrueTrac
2001 Ford Excursion Limited 4x4 7.3L,V/B Spring Mod, ProComps, Hellwig Swaybar, & other 'Necessities'