Surly's have different hubs. Q/R, Thru Axle, Boost, Which bike do you have and why won't it work with the Bob skewer? I wouldn't think the trailer yoke is the thing to modify. I would be looking into whether or not a longer skewer might be needed (they even have a 160mm for Santana tandems) or Maybe the bike hub will need to be changed to one that can accept a Q/R skewer.