If you're only going to be traveling off and on the easiest thing for you to do is to have a family member or trusted neighbor/friend collect your mail daily from your mail box and separate it into junk, catalogs, and personal mail/bills. The junk/catalogs can wait until you return.
When you're at a RV park or public campground for a week or so, ask the person holding your mail to mail it to you either at the RV park, if they accept mail or at the local 'small-town' post office - definitely not a medium/big city.
You should first check with that post office to confirm that they will accept General Delivery. They always have for us. If so, have the person put all your mail in a Priority envelope or box and ship it to your name, c/o General Delivery, city, state, zip. It will reach you in 2-4 days. Typically, you can have this sent every 3 weeks or so and you'll be just fine with bills, etc.
Also, for more ease, set up all your bills via automatic pay through your checking acct or credit card and handle them that way then you don't have to worry about getting a bill on time.
You'll soon get the hang of it and it'll be a very easy thing to do - IF you have someone reliable to handle it this way.
Full-timers usually have a mail forwarding service, as we do, and that mail forwarding service is our permanent address. That's where all our mail goes. We haven't had any problems with the General Delivery method in 16 years! In fact, I'm going to request my mail right now via email and I'll receive it in 2 days Priority.