Cool to have a Time Machine, getting a 2103 Laramie. :) Hopefully its the 2500 or 3500, not the 1500 that has a load capacity of only 1600#.
For $20K, you can get a late model used TT, just might have to look around for a bit or just plain get lucky. There are some decent new ones out too for that price, but the choice is limited. We just bought a new FunFinder (in sig below), and it was under $20K.
Look at http://www.labadiemotors.com/ he is a local (to me) dealer that sells and ships all over the country, to Europe, and Australia. If he carries the TT you want, a deal can be made. Unfortunately, he does not carry FunFinder, but he does carry other name brand lines.