I have been jetting almost exclusively for a few diffrent co's now for years and US jetting when they had the trailer and skid/truck mounted units with the Hatz deisels were great. the new ones with the "lambordini" deisels are problematic at best --our old unit 2003 USJ truck mtd (FORD F550 super duty-enclosed) is more reliable than our 2008 unit USJ has been out NUMEROUS times to work on the jet pack engine. Conversely the 03 super duty ford is a POS and the 08 Iszusu is eminently reliable.
We tried a Spartan once --total crap bad design, overstated specs, VERY light duty trailer. Almost started several fires and burned/melted asphalt driveways due to horrible exhaust system design --exhausts straight down ,,,under full throttle this was a major problem. It was sold at a very good price to another co when it was six months old.
This is unlike Spartans cable machines which are top notch.
In northen regions the trailer units -even with anti-freeze are not so hot you either have to mess with anti freeze or keep it re-circulating all the time --either way it can still freeze. If you take too long getting set up after pumping out the anti freeze, someone forgets or dosent do the propper procedure after jetting--frozen unit.once that happens hope you got a heated garage to park it overnight. Down south or late spring through early fall they are the way to go -more flexible and not dependant on an single truck for transport. During the winter up here the boxtruck/thermo body/heated is the only wayto go. Have a tech spill a bunch of anti freezeon a street, in a customers driveway then the burough finds out or the customers dog drinks it--can you say EPA? lawsuit perhaps? Even if you run RV antifreeze its still one more expense,repetitive I might add as the antifreeze seem to disappear rapidly as you purge and refill the jett system -some- is jetted down the sewer and the mix gets weaker and weaker as each cycle occurs.
the USJ units like the trailer shown above are good for a easy 20 GPM and the power units are long runners the pumps are rebuildble and can be run dry without harm. And are designed to be towed full of water. the spartans are NOT. the Spartan we had CLAIMED 20 GPM but our tests showed it was more like 15. I think they need to do some more real world testing and design refinements. The USJ will carry more hose and has more room in the side boxes. *USJ jett heads should however be gold plated for the price. The new ones have porcelean inserts instead of the machined stainless steel so DONT DROP THEM ON CONCRETE OR ASPHALT!! ask me how I know!
* I recently priced out A USJ "super spin" root rat off the service truck at $959.00 !!!! Just a bit expensive.
BTW USJ's on site service is excellent they come out usually within a day or two of our call and fix most problems within an hour or so.
thier hoses are way too expensive though--we use an local industrial hose supplier who provides the same jetting hose 5/8 and 3/8's in whatever length we ask for and terminates it for us in thier shop right then and there --they keep bulk hose in stock now for us. In the even that we distroy or damage a hose we are back in business that same day.