I just completed a restoration on a Conroy(Glastron) aluminum trailer and it is a 1985 vintage and was purchased with the 1985 Timi on it. I couldn't find any further info on the web to help, but it appears they were only made by Conroy that didn't get involved with Glastron until late 70's or early 80's. Please don't quote me on that I'm a rather poor historian outside Carlson's. Cant see any reason you couldn't find one and put a GT on it, but it might take a bit of modification possibly to look correct for a 15' boat. Seen several that have 16's and metrics on them that fit well. My CVZ is shorter than the bunks by about 16", but it is designed to hold the Timi. Just my $0.02