I'm sure it's possible with some careful planning. If you're able to remove the coroplast from the underbody around the bathroom sink and expose the hot and cold water lines to the sink, you could tap into them with some pex line and tees and get water to that sink basin. The kitchen island has water lines running to it so that's an option too.
If you do innovate a way to set up a "wet" sink, please take pics and post them. We'd love to see your handy work.
2017 Keystone Bullet 308BHS in Saddle.
2017 RAM 2500 Laramie Mega Cab 4x4 Hemi 6.4L
2008 GMC Yukon XL Denali (SOLD)
Hensley SwiftArrow Control Hitch with 1000 lb Spring Bars
Me, DW, (3) little DS's, and 1 rambunctious Boston Terrier