Re: Pontoon Boat... Question
Short answer, yes.
Longer answer, it wont be ideal. While fully assembled they are pretty cumbersome and awkward to manhandle around solo. You are bound to scratch the paint on your Xterra sooner or later.
I would guess that the stock rack is going to be too small as well. I guess it all depends on the type of pontoon you get. I have the cheapy costco pontoon and it sits on top of the bed of my truck. My last truck was an F-350 and it would sit perfectly on the bed rails. I'm thinking you are going to need a wider rack. I saw one like mine on the roof rack of a Subaru. However, it was some fancy aftermarket Thule thing.