There was a F150 camper mated to a Bowen Customs bed on a Tundra here: For Sale: V2 XL Platform Camper (Black/Stone Gray) for 6.5ft Ford F150 (2015-2020) - $7500
It sold, but maybe the seller could get you some info if they’re still active. It’s the only GFC/BC pairing I’ve seen so far.