Hello John,
I have a three way powered Waeco cool box. Whether it is the same as the Tropical model I am not sure. We find it great.
Whilst on caravan holidays, its used on 12V whilst towing and then it sits in the awning and provides extra space for the larger milk bottles, beer bottles and fruit jucies. Its strong enough to be used as a seat for the awning table usually mains powered.
I also use it for camping, both with family and our Scout Group, where its gas powered.
Its great for family picnics - 12V powered
Then at home it is used most of the year for much the same use as in the caravan to acts as a suplimentary store for milk and fruit juices, but its also good for parties for the bottles and cans.