What's the problem with radiator price for Motorhome?

Never said what it was for but I replaced mine in a 97 Winnebago Luxor with a 325hp Cummins. Got a new copper radiator installed for around $2000. I know the only place I could get a new replacement was from Freight Liner and it was around $1500......Mine wasn't leaking but most of the fins were gone and the tubes were just bouncing up and down so I fixed it before I had to call Good Sam and get raped on the road. A place that works on big trucks did the work...