When i spoke to tony he was saying the machine came in around 2500 also you would want 2" hose.
There all 3 stage vacs.
Think form the ampage it might have extra cable maybe am not sure.
The thing with alltec is they do research and dont just put an extra vac in withought thought.
Wont be much heavier with the extra vac.
Also remmember there will be times you wont want to run the extra vac etc.
Didnt get a chance to see it mind you but guess it willl be like the advantage maybe sharing a swith with the heater