Truckman,wow, sorry to hear about your accident,wish you the best!!! And don't always listen to those Doctors

10 years ago I fell 20 feet onto a concrete floor at a construction site, shattered my lower leg. The docs said I would not be able to work construction again and have a permanent limp.Well, I don't limp,hell, I can still dance like fool!!
On overhead door operators,I wire up commercial and industrial door operators,they are all chain drive. The best ones are made by Ranor,but that's heavy duty stuff, probabluy 3-5 times the cost of residential openers.