Remember even though the Spec of the Pump says say ie. 2500 psi does not mean it will operate at that level.
In many cases, most Manufacturers machines only do 1000 psi of working pressure.
The reason is, that their Heater Coils are made of Copper (Low Burst Pressure Rating) so anything above that pressure will damage the unit. Usually they will put a constant Bleeder Orifice Jet to 'Cap off' the Top end of the pressure capability of the Pressure Pump in order to prevent you from going any higher than what the Copper Coils are Rated for.
Here are Specs of our Blue Baron Truck Mounts where Pricing vs Performance is in the "Green"