I agree with the 90% tech and 10% equip. But you do need both. I run the following and do better then some truck mounts out there. Maybe because the knowledge isn't there, but this is it;
Mytee ltd5 (runs out of SUV upright)
Generator to run two cords from mytee 5
Hot turbo heater
Air hog (also has apo)
No tanks, utilize apo and af (toilet/faucet)
*keep 25 gallon of water in case
Oreck orbiter (my 175). Does great!!!!
Water otter for tile and grout, hard surface
Wands, tile spinner, counter spinner, upholstery tool, stair tool, broom, vacuum, rake, etc
Chemical ( carry larger portions what I need for day and smaller portions of other)
Towels, rags, etc
Brochures, invoices, biz cards.
Plus as back up in case mytee 5 goes down I have water otter and air hog to finish a job.
It's the personal touch, customers like the idea of a custom set up that is a little different for every home. Sometimes I use some, sometimes I use all!!!!
My set up with vac booster I can run 150 feet of hose easy and not lose anything. Haven't tried more than that.
And yes it all fits very comfortable in the SUV. Love the flexibility of using such a system.