You do not have to attend all of the days. Your truck will not be stuck but they encourage you to stay put during the day. On another note, the Stovebolters tend to park near camp and a lot guys like to work on their trucks during the show and go for test runs. This is off to the side of the actual show fields.
Absolutely on the motorcycle and yes tent camping is allowed but please register for "camping" at the registration desk.
See you in Winchester!