If there's too much for us to transport, we should only take the magical items or exotic tools, things that will be difficult for the vampire to replace. Mundane equipment and such are easy to come by in these parts, it wouldn't slow him/it down much if we destroyed those.
I think we leave whatever we can't carry in the room, sprinkle it with all the garlic in our possession, collapse the ceiling, and hustle back to town.
In our present condition, we probably shouldn't be out in the open fields after dark.