I am a male, age 70, 6' 4", 270#, active, looking to purchase my first e-bike. I would like the option to buy a dog carrier and take my 65# Lab with me occasionally. I plan to ride mostly on the streets or smooth dirt paths. I am more interested in reliability, comfort, safety, and power than speed, or distance or performance. Some of the Rad models suggest that 6'2" is the maximum, and 2 models are recommended up to 6'4''. Your thoughts and opinions are appreciated!