Wow, I learned that I could have a wet vac drain.

My yard is absurd clay. I've used my wet/dry vac, along with an electric pressure washer, to dig holes and remove tree roots (easier to cut what you can see).

A drain would increase my work time, at the expense of thicker sludge when I'd have to empty the vac manually. What I really want is to move the mud slurry, not store it. I suppose I should build an open frame to replace the vacuum body, and just use the pump lid.