After seeing the BierMunchers Rolling Kegerator (BYO Published)
thread it got me going on this idea so I can bring beer to a family reunion, party or a cottage in a kegerator like fashion. Sharing is caring!
I measured the top of my wagon and that was the only measurement needed.
The bonus of this set-up is I can lift it and wheel it around by myself, maybe ways 100-150 lbs fully iced. It can be fill with ice all the way to the top of the collar.
I used basement wall insulation board to create the collar and cover, then added stick on tiles. The collar was glued together with construction glue, it is removable from the cooler. The best thing about insulation is it's already grooved and fits great onto the cooler top conserving the cold in even better.
I initial put 2 bags of ice for starts then 1 a day. I make ice at home and purchase them on the road. Or i sometimes fill it to the collar rim 4-5 bags and bleed the water everyday, last about 3 days in Canadian summer temp.
I'm sure you can figure out the rest or give you ideas.