The book "D Day Through German Eyes" ( link ) includes a fascinating recounting of the experiences of an officer in charge of a Goliath team.
The Germans actually integrated Goliath teams into the beach defenses as anti-tank weapons, and built bunkers specifically for the Goliath teams. These were relatively small bunkers, with small, low openings to their fronts that were fully defiladed by earthen berms, so that the Goliaths basically just trundled out from behind small dunes onto the beach.
Evidently the principal weakness in the approach, not well considered before-hand, was that the beaches were somewhat torn up by pre-invasion bombardment and German mortar fire. Turns out Goliaths were not at all good at negotiating cratered ground.
If you think these are interesting little devices and want some insight into the ins-and-outs from a user's perspective, or you just like hard edged first-hand accounts of WW2 combat, I HIGHLY recommend the book!
-Mark
(aka: Mk 1)