For overseas tours I now use a folding bike. These can be folded small enough to transport easily by air or rail, and can carry your gear. There are numerous places to camp in Portugal and Spain, but occasion I have spent the night inside or next to a abandoned buildings or barns. About half the time I have found myself invited by locals to dinner and to stay the night at their homes. The people you can meet are just as interesting as the scenery on long tours if you are willing to stop and chat.