We've hauled 2 on the ladder rack, which holds them very well. The last few times out we just carried one back there. I think its a Thule ladder mount. It anchors very well and the bikes are tied on nice and tight.
In 5 years, knock on wood, we've never had a problem. Our ladder holds me, and I have in the past been over 300 - I periodically check the hardware that anchors the ladder, and tighten them if they are slightly loose.
The bike handle stuck out just enough for me to watch in my mirror...I never saw it shake, unless the whole trailer was shaking.