As noted,
www.handgunlaw.us is a handy free resource,
but Id suggest checking your travel route or LE agencies on the way. Gun & carry statues change often. State AGs or a state LE agency might post a change or reverse a policy then expect you to know it.
Id add that if you travel often, Id get the 2013 ed of
www.Gunlawguide.com .
Clyde