My birthday was just a week or so back. Kids wanted to get me something for when we travel in our fiver, but couldn't find anything special or unique. Ended up giving me a mix of individually wrapped products from Omaha Steaks. Perfect, and something I'd never have thought of. The mix they got for me included a few steaks, marinated chicken breasts, hamburgers, gourmet hot dogs, twice baked potatoes, apple dumplings, etc. All individually wrapped and easily thawed in a sink of water. I keep them in my freezer at home. Before we leave, my DW and I figure out what we'd like to cook and simply throw what we want into the rig's freezer. Gotta love those bacon-wrapped filet's grilled over a fire...
I was really surprised, and appreciative of the thought. Might work for you, too.
Plenty of gift cards suggestions and they are the gift that lets the receipient choose something they will like but....
If the gift card isn't doing it for you, here are a couple more idea's that almost everyone would find useful.
Something to lounge around in inside the camper. Hopefully you know if he is a robe, pajama or lounge pants guy or just a shorts and tshirt guy.
If he likes to grill, maybe an apron with something funny of appropriate on it. If he like nascar or NFL/NBA/MLB/College sports, one with his favorite team might be an idea.
Along those same lines, go to his favorite teams website and see if they have a store online. Plenty of gift idea's there that he could use on the road.
Good luck and give him a happy birthday from RV.net members!
2011 Silverado Crewcab 4x4
2012 Passport 238ML
Hope your travels are safe and the friendships made camping are lasting.