Captain at 5' 10" and 170 lbs. (trying for 160...New Year's Resolution)
Stoker #1 at 3' 6" and 42 lbs. (growin' like a weed with no added weight)
Stoker #2 at 4' 8" and 60 lbs. (no growth spurt for a while)
Stoker #3 at 5' 2" and 85 lbs. (looks to have hit her final height)
Bike at 39 lbs. with all bags packed and 4 large water bottles.
So... we range from 251 lbs. to 294 lbs. depending on who's on the back.
Greatest strength-to-weight is with stoker #2, however. He can really go, when he wants to...which seems to be most of the time.
Of course, there's the rare, rare occasion with stoker #4 at 5' 2" and no publishable weight. She's killer on the flats, but slows to a real crawl on any incline.