I went with Duracell for my portable solar center last year, and this year in my new Cargo "off-road" trailer. Not a lot of years worth of experience, but from what I can gather here, these Duracell (2 35's and 2 80's) are made by Dekka or East Penn, and these makers have a good reputation. I have been happy so far. Picked all of them up at Batteries Plus/Bulbs Plus.
I went with agm for both sets, as my portable solar box and the trailer batteries are used indoors, so to speak. While the agm can vent bad gasses, it would be more of an anomaly, as opposed to a conventional wet cell that is more typical to vent. Plus, I have my trailer batteries in a box on wheels, that I can roll into a better position for traveling. Decided that AGM would be better.
Might be helpful if you clarify what you mean by "put them in the RV, but mount outside". If they are outside when charging, then my second consideration does not apply to you.
Looks like a fun combination you have there. I spent a lot of years stuffing things in, on and around a Wrangler.
Craig