I bought a Magnum trailer unit from Benson Enterprises in Knoxville. I brought it home in January and it now has about 350 hours on it with no problems. Kohler 18 HP engine, General TS2021 pump, Baldor generator. I liked that the fuel tanks were large, it can run with the burner going for 8 hours without refueling. The trailer was built by Benson for the rig and is fully boxed steel. The only downside to the machine is that with the trailer design I have to put most of my tools and chems in my truck but that hasn't been a problem so far.