You could build a 36h XT M756 hub to an Andra or Sputnik rim with those Sapim Strong spokes for a little over £100 in parts.
My experience of tandems is more from the track but given that I know wheelbuilders that say the g force loading in the corners on the track gives wheels a harder time than road cycling does and I've never seen a tandem specific hub used on the track then I'd go out on a limb and say a sturdy 36h hub and rim like the XT/Andra combo would be more than sturdy enough.
I'm sure you're right and they'd be plenty strong enough for the road. The trouble is when we take it off road - even on parts of the national cycle network. Going over a tree root at any speed on a fully loaded touring tandem takes its toll
£240 seems like rich rich money for that wheel.
You could build a 36h XT M756 hub to an Andra or Sputnik rim with those Sapim Strong spokes for a little over £100 in parts.
My experience of tandems is more from the track but given that I know wheelbuilders that say the g force loading in the corners on the track gives wheels a harder time than road cycling does and I've never seen a tandem specific hub used on the track then I'd go out on a limb and say a sturdy 36h hub and rim like the XT/Andra combo would be more than sturdy enough.