I have the LL Bean King Pine 4 (the "Taj Michael") and it has served me well at many a Gathering. I've never been wet inside at all, and it seems sturdy enough, especially staked down, that if a storm blew through it would hold through the wind. I can stand up in it, and very little ducking at all is required to get in. It is humanly possible for me to put it up alone.
The King Pine 6, if you opened both doors, you could bike through. It's a big, beautiful tent. If you really want space (and have setup space where you'll be going), it will definitely fit the bill; however, 2 people and the lab will have more than enough room in the 4.
The newer versions out this year greatly improve the screen room by adding optional fly along the sides, so that you don't end up with wet ground in the vestibule if it rains.