RE: towers trainer..
RC/Ron, from your description of how they run, those are going to be fine. I'd use them. Like I mentioned in an earlier post. I was pleased with my Avistar and it's TT GP42, and I'm familar that 40FP and know its a solid performer. You're lucky to have them. Won't be a "Rocket", but will fly just fine.
Curious. Where is the flying field in South Bend? I haven't been down there recently, but we use to visit South Bend when I was younger.
RC/Ron, go over that Tower Trainer with a magnifying glass, get the CG correct. Don't hesistate to ask a question.
Tom