I realize this is an old thread. Consider electric motorcycles and bicycles. Segway makes a light one, and if you have solar you can recharge it and the long term costs are low after purchase, plus they are very light.
Still under consideration, at least Ebikes. The electric motorcycles I've seen are quite pricy and don't seem to be quite there yet in terms of charging and charge life, particularly with a van electric system. The big advantage I can see with some ebikes is I can carry them inside of my vehicle instead of on a hitch-mount carrier and not attract the wrong sort of attention. But kind of a sitting duck if I had to cover ground on a highway.
I'm going to wait until I sell my current motorcycle, a touring bike, and 2 1970s Dutch bicycles, which were ideal when I lived in Venice Beach, Ca. where it was flat, but are much too heavy to travel with. The motorcycle and bicycles are both in storage in Mississippi and I'm not sure when I'll be back.
It's a terrible time to buy any used vehicles right now anyway. Looking at some lighter weight, air cooled dual sport motorcycles from years back and people are asking more now than they originally sold for new. Even at 10 - 20 years old and with 5-10,000 miles. Hopefully prices, technology and availability will improve over the next year, and the right combination of cost, utility, and risk will come to me.
In the mean time my brother has a 99 Kawasaki KLR250 and a hitch mounted carrier he uses on a truck and I'm making plans to visit and try that out with my rig to see how it handles. the bike weighs around 300lbs which is in the neighborhood of bikes I'd want to carry, hard to find many much lighter. Might help with my decision, either be able to rule out a motorcycle or say that would work.
