Kevin -
There should be no need to pull the sink. Look around under the sink, figure out where the pipe in question comes up through the floor, then figure out how to get access to it. Removing the cabinet doors and the vertical stile between them is easy - a few wood screws - and will be like access magic. Been there.
If you really want to try, here are some thoughts. If the clamp is a circle with a protruding folded portion, you may be able to undo the fold enough with end nippers or a screwdriver to get the ring off. If it is a copper PEX ring, I don't think you can do it because there is nothing to grip or pry. Was TM using PEX or PVC in 2007? I don't know. I suppose an abrasive-edged grinding wheel on a Dremel tool might cut it, but it would most likely cut the pipe or hose under it, too. Not worth the effort, IMO.
Even if you can get the clamp off, I share Shane's concern about the condition of the pipe or hose above it. Sixteen years exposed to the road crud under an RV is asking a lot.
My suggestion is to go at it from inside. But if you decide to try it from the outside, you have little to lose but some time.
Let us know.
Bill
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