I respectfully disagree. the SdKfz302 and 303 where expendable, the SdKfz301 (Borgward IV ) dropped its charge then exited the area. In the picture the charge box is the front section with a couple of rocks on it, the front of the vehicle was rather slope shaped and the charge would slide forward and off, and the vehicle back out and away to be reused (good luck with that).
Yes, that was the design, I won't argue that.
However, by the end of the war a number of things conspired against it being used that way. Even though the "C" variant had the thickest armor, even .50 cals could de-track it. It was also slow, and not particularly stealthy. Even though the radio range was up to (an optimal) 2Km, in practice it was much less. This left the operator well within artillery range, and often even small arms fire range, while the machine slowly trundled back for recovery and re-arming. Realistically, it would get chewed to bits before this happened. This left the operator in the danger zone for longer than any sane person would consider a good idea, for no appreciable game.
Can't remember where I read it, but the few late war reports of it being used, as seen by the Allies, was essentially as a radio controlled kamikaze. They would be controlled forward, then lit off without dropping the charge, the interior of the hull having been stuffed with extra explosives. After this, the operator would quite sensibly hoof it.