I'd say that for most of us those restrictions and requirements are a non-issue. Self-quarantine and/or test out. Since many of us make being self-reliant and self-containment part of overlanding we're basically self-quarantining everywhere we go, the exception being when we need to stock up on supplies, so best be sure you have enough to get you by until you reach the self-quarantine time or test out. In most cases, they are wanting to keep travelers out of crowded indoor locations; Restaurants, stores, bars, etc. because those are the places travelers tend to go.
If you're camping and sticking to camping, hiking, fishing, etc where there are no other people around then you shouldn't be considered to be violating self-quarantine requirements. For example, Maine was one state we were thinking about traveling to again this summer and they state "People in quarantine may leave hotels or campsites to do outdoor activity such as hiking." This is reasonable and I would hope other states would be similarly reasonable.
Our main trip this summer wouldn't be through or to any currently-restricted states so I'm not too concerned, but folks should definitely be aware of what to expect when traveling to another state if they plan on spending time around other people.