Plenty of people will chime in with specific advice but you're sensing a key issue:

The best signup bonus is not necessarily the best everyday card.

If you don't fly much, you probably want a great cashback card, such as the Fidelity 2% back card. (There's a thread in the "other CC programs" forum)

Also, if you're hauling a camper, you probably buy a lot of gas. So think about the Pentagon Credit Union Visa with 5% back on gas.

This should probably be a separate decision from which signup offers to look for. For example, right now you could sign up for two AAdvantage credit cards and land a total of 150k miles.

Try to determine how many credit cards you're willing to sign up for and how quickly, then compare to the signup bonuses available.