I built a portable igloo cooler kegerator (https://www.homebrewtalk.com/showthread.php?t=172047) for when 5 gallons is enough. For large group events, contests, and weddings, I take 2-3 5 gallon kegs to serve. I started by just putting them and a load of ice in a brute trash can (with water spigot drilled into the bottom for water removal) and a tap box made with foam and spare plywood with party taps. After a couple years, the plywood unfortunately (not surprisingly) got moldy.