Dennis,
We did same on the prior TT. For about $250.00 (this was like 8 years ago, adjust for inflation), we purchased an apartment sized regular ole house frig.
Now, we don't make it a habit of driving for 12 hours in 90 plus degree heat, SOOOO, we had no trouble with stuff spoiling. Then, factor in that we stuffed that frig, so, the goods kept each other cold??
I loved that frig, wanted to take it out and put it in Tana, Al would not hear of it, but, I wanted that frig!!
I would go there again, but we don't boondock, and do other types of travel that would deem the propane to be a good thing. Don't need it, for our kind of traveling/camping/rving.
I loved that I could get 2 weeks of groceries and frozen foods in there, and ya all remember, my DH LOVES to eat!
so that was a lot of groceries!