The Mi-T-M is 1500 PSI has a quick-connect fitting on the end of the wand, and the MTM Hydro long-range foamer requires at least 1500 PSI and has a quick connect adaptor- you should be fine.
We carry several brands of environmentally friendly Pressure Washer Vehicle Soaps. They are at the proper dilution for pressure washer use, and won't harm the pressure washer pump if you decide to use them with the siphon hose on the pump.
If you want to step up into Professional Pressure Washer Vehicle Soaps we have several good brands that are available in large quantities, and are still good for the environment.