what is it and how rare is it?

[1985BigRed250ES]

here is a link. this person has been trying to sell these for the past six months that i know of. what are they? what are they worth? how rare are they? who built them?

http://littlerock.craigslist.org/bar/2081620102.html

thanks

Jordan

[portland250r]

its a truckster cart google kohler 3 wheeler.