Scott, we were in the Elkhart area earlier this year. Don't miss the RV Hall of Fame and Museum. For surplus try here. http://www.rvsurplus.net/ Also, a few miles over the border in Michigan is this place which is open on Sunday's (the others are not). http://bontragers.com/ We spent several hours here. They have a big variety stacked up all over the place, and you just have to search for what you are looking for outside and in about 4 buildings. A HUGE inventory of replacement thermal windows for MHs and TTs and 5ers.
Stan