RV plumbing, by and large, is just "off the rack" PVC. I'd trace out what you want and swing by any Ace Hardware and get what you need to make the replacements. You might even make out with one of those flexible/expandable traps. The water supply parts, also, are "off the shelf", common, hardware store supplies, you don't need to go to a RV dealer to work on those parts. Even regular household sink faucet assemblies will fit with no modifications in most cases. You'll get a wider selection of parts and cheaper prices at your favorite hardware store.
My 2 cents, your mileage may vary...
2 Cats; J-Lo and Ragamuffin :R
2014 Thor Tuscany 40RX DP
2011 Ram 2500 Longhorn CTD HO
2011 Keystone Cougar 318SAB (now gone)
2008 FunFinder X 210WBS (Sadly gone)