It should be two or three man crews (like PIAA), with ARs on the sidelines.
It's shouldn't be officiated anything like a PIAA game, if for no other reason than the competence level of a lot of those guys leaves a lot to be desired. In fact I would argue that the PIAA system of having three refs on the field instead of one on the field with two linesmen leads to more screwed up offsides calls because the ref on that end of the field gets caught way out of position. If you are going to do it all you need to do is add one official to the field like the NHL did. Leave the two guys on the lines where they are with the same responsibilities that they currently have.