fwiw, my son (26) the mechanical engineer, says to never hang more than two bikes off of a bike rack.
Something about torque and moment of inertia.
He has had failures with three bikes, so he has some experience.
Having said all that, his mountain bikes are high end downhill racing bikes. They weigh 40-50 pound each. He does not like risking a loss of a $9,000 bike.
If you do choose to hang them on the back of the TM, at least cable them to the TM frame. That way if anything goes wrong you will drag them down the freeway instead of dropping them on the ground in front of the guy behind you.
two 50 pond bikes is the same weigh as three 30 pounders or four 25 pounders. Weigh your bikes.
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