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Probably best to start at the magazine rack at your newsagent, buy some relevant magazines (or have a flick though if no-one's looking!) and find out who the publishers are, then do some research on the net or contact them directly, you never know you might be able to do a personal deal with them.
There's a few different affiliate programs for magazine shops, but I've never seen one with a specific banner for a motor home magazine, I would recommend finding a suitable magazine, and then getting a banner created (i.e on digital point forum contests for approx $10)