My wife and I are big people... I currently have two honda shadows aces but she doesn't have a license to drive and is afraid of trying. We've only rode maybe 4 miles on my shadows. She always feels like she's going to fall off and neither of us are really comfortable. Last year we went to Tennessee and did rent a Harley Trike. It was ok, however it was also pretty small and not the most comfortable ride. Do they make some kind of seat extensions that would give us an extra two or three inches? I'm not picky on brand. Would actually prefer something other than a Harley to save a few bucks. Any suggestions would be awesome!