A good example in when on the road and two dual meets in one day, recent example OSU v Lehigh @noon then Bucknell @7pm. It would be difficult to do the travel between Lehigh and Bucknell then make weight again 1 hour before. Instead just let all 3 teams weigh in same time before the Lehigh match with 1 pound allowance. This gives the advantage to Bucknell but OSU I'm sure doesn't mind that. Also when they've traveled to N Colorado then to Wyoming same day have done similar without the 1 pound allowance, everyone weighs in same time giving an advantage to Wyoming but that's part of the point of the trip makes for a tough two match day at altitude, second match higher altitude with home team advantage on weight.