The reason the SWS has more speed and armor is because it's the most important OKW unit in the game hth.
And? Does it need high speeds to set up on base sector? Thats not really an argument at all.
If Ambulance can get to the point of Major deployment without any problems, why sws truck should be any different here?
Unless you don't use it as a means to expand your base, but a combat unit for pushing infantry out of cover for free wins in early engagements, which it was not designed to do.
You can also slow it down to ambulance speed and acceleration(which again, certain people believe to be fine for some reason) and put the upgrade for speed like brits had.
Or you can admit its not fine and actually support an underperforming unit, which at the moment is nothing more then slugging med bunker.