I'm an average size adult female and I've slept comfortably on the Poly and VGF trundle. The VGF trundle (in the original building, NOT the BPK) seems larger to me. It might be a real twin.
VGF 1 BR has an actual king bed, the trundle queen bed, which I think is heads and shoulders over the sleeper sofas, and the twin trundle. Adding the studio for the 2BR lockoff would make six total beds, including one actual king, which is rare in DVC. This is a tough room to book, because it requires the studio to be open.
Poly also has the new trundles after the renovation. If this is really a big deal, you could do 3 studios instead. For Poly (or VGF2), that would give you 9 sleeping surfaces, all new and nice.