I bought this one: Robot Check
It works OK from the outdoor kitchen in cooler months.
I don't bother in warmer months because it can't keep up at all if in the outdoor kitchen, and the exhaust makes way too much heat if I put it inside the trailer. Also it dumps ice pretty regularly which would wake us up all night long. So inside the TT is out. Outside the TT works OK in cooler months only.
We have made fall trips, including a 7 day trip for cycling, where I did not have to buy ice. I regularly went to retrieve ice from the ice maker and brought inside to the freezer. This provided enough ice for cycling and regular drinks with ice. This won't work in summer in Texas. The ice melts in the bin before the next set is dumped in, so it never makes any progress. I tried shading it and putting a styrofoam ice chest over the ice bucket part to try to help it out but it wasn't enough.
Basically, it works pretty well if the ambient temp is cool. If the only cool ambient temp available is inside the trailer, it will make your trailer hot with the constant hot exhaust and keep you up all night.