I like chain driven motors because I live in a very hilly area. I haven't heard of the motors overheating. Many trikes are only driven with one of the rear wheels being powered anyway so I don't think a hub motor is a problem for that, just put it in the non-driven wheel, then you would have two wheel drive in the rear. If you only have bridges as 'hills', the hub motor would be fine and they are very quiet. Is this trike a recumbent? By the way I have 3 of the 500 watt Cyclone style motors if you want to buy them cheaper than retail.