At first glance it seems like a though scenario for the US. The germans have more and better tanks, and in addition they have a double mortar, which is a real powerhorse. The only thing going for the US is time. Since the US have only 6 shermans, and equal strength in infanteri, I think that a nonaggressive US player is best. Ie, not rush out the sherman at all, but keep them behind and wait for the germans. Ie, have them stay behind cover and put them on op-fire mode.
A tiger may be destroied by shermans if either using combined fire (by two or best three shermans) or fire at point blank range (with a little luck a single sherman is enough to heavily damage a tiger). The problem is ofcourse the 5 panzer the german have in addition to the 4 tigers.
I confirm the beauty of the map, it really offers great possibilities for maneuver for the Americans in trying to delay the inevitable German advance.
It could easily be a scenario with 9 boards (instead of 12) with the possible reduction of game turns by 1.