Why even consider a 1x, given that you'll be carrying camping stuff? A 42/28 double gives you so much better range. The shimano grx or whatever it is seems like a great option , but you'll have to research the details.
The new Trek 520 Grando comes with 42/28 with an 11-36 cassette. Front
derailleur is Tiagra, rear is GRX 400. I am likely gonna be picking up one of the new Disc Truckers soon but am unsure yet whether I will buy the complete bike or do a build-up from a frame. If I go the latter route, I may very seriously consider replicating the 520 Grando drivetrain rather than going with a triple. My current main bike has a road compact with an 11-32 cassette and I can ride on the 34 ring all day and never spin out except on rare downhills. Seems to me that a 42 ring should be more than I would ever use. The gear inches for both 28/38 and 26/34 (the lowest gear on a factory Disc Trucker) is 21 for both.