Sort of a motorcycle.....Well at least it has handlebars, I give you the Kettenkrad light weight gun tractor. I have seen this in operation on one of the museum's open days, compared to a Jeep it is hard to see the point but it is still an interesting thing.
The third photo is a Churchill WWII flail tank, this thing's job was to trundle along using the flail at the front to detonate mines, at the back it has dual post dispensers to mark the safe trail for following vehicles or infantry. That it did this job whilst under fire from defenders is easily seen in the divots knocked out of it in various places. This particular flail tank is one of only two left in the world and is the only one in operating condition.