I was thinking of getting a commercial etrike like a liberty, or gromier. Then I saw the 300S with seat and although it is a scooter it is appealing. I was thinking of attaching two bicycle TRAINING wheels at the rear or even the front as well turning it into a more stable vehicle. I am a senior with balance issues. A 2 wheeler will not work. These are 250 watt units. Would that be enough to go up average hills? Perhaps a 350 or even 500? Has anyone here don this> Seems a simple solution. Lots of savings over a commercial trike. All advice offered welcome. I can put one of these together in an hour. No modding. The photos show enough avel thread to mount the wheels. If this is practical I will go for it. Plenty or on-line sites to go to.