We have used the arb 42qt for many adventures for the family(and years). We once even worked two families on our fridge for 7 days. The other family used ice for the non frozen stuff and we had the frozen stuff for 2/3 fridge and other stuff on top. As the days went along we just shifted stuff over to the fridge as the ice melted. I know the B&B Miller bought the big fridge(60qt) it does take a direct connection to a big amp feed if you are thinking of going that direction(almost needs to go direct to the 2nd battery).
The waeco may of gotten a good review, but when I went on training with Scott, it would only work on 110v, it seems like something internal went south. Not to say this will happen, the weaco has some nice features and I am sure you will enjoy it Dan.