Building a recapture/recycling trailer

So I’m new to the industry, I have a small 3200 PSI machine right now but will be getting a 3800 PSI machine in a couple of months. Sticking to small residential stuff for now.

I live by a lake in the NW with a lot of potential high-end customers but 1/2 the driveways drain into the street & out to the lake (big no-no). The cost of buying a trailer already setup for recapture/ recycling is insane! Anyone ever built their own & if so how? Thanks!