Here is my money-maker. After downsizing from a 2011 Tundra 4x4 and having enough equipment for 5 employees, I've condensed my window/gutter/pressure/house/dryer vent cleaning services into a 2003 Tacoma. In the bed that's a 6 stage RO/DI with dual electric pumps (pre RO and post RO), 25 gal buffer tank, 4/4000 pressure washer, space for an air compressor for dryer vents, surface cleaner, or buckets and debris for gutter cleaning. On the tailgate is my custom screen cleaner. On the back is 200' of pressure washing hose. On the side are 150' of black garden hose that feed the system and 300' of wfp hose. On the top is a 28' ladder, 16' ladder and 3' step stool. The sides have tool boxes for pressure washing and gutter cleaning/repair.
Inside seems cramped, but it's okay. All my tools, window cleaning buckets, rags, vacuum, and leaf blower sit behind the seats.