If you are willing to sacrifice enough funding and space you can make just about anything work. The standard charter fleet space and investment parameters always come into play here. Low cost, high temp operating environment, high door use levels, wear on seals, needs for functional drainage, low or underpowered, power consumption and much more point to the use of top loading. For charter boats top loading is the right tool for the job of maintaining refrigeration. If you really study it the grossly inefficient front loaders also create great heat while generally falling short of accomplishing their task.