We replaced the OEM faucet in our 1993 MH last year. I tried everything to get that thing out. Finally gave up and called a mobile mechanic. He ended up only getting it somewhat loose, but at least then he could get a Sawz-all blade in and cut the old faucet apart. Installing the new one was a piece of cake.
We decided on a pair of short flex risers so that we could attach them to the faucet while out in the clear, then drop them down the holes and connect to the pex down there.
Looks like you have plenty of room to work, but you still might want to use the short risers. Makes for an easier installation. BTW, if you have a Corian countertop, it cuts very easily if you need to modify a hole or two. Just makes a LOT of very mobile dust.
David Lininger, kb0zke
Heartland mpg 181 (sold)
1993 Foretravel U300 (for sale)