I agree with the info and advise given. I had my own experience with balance and pendulum effect with my 2014 Scamp
side dinette plan. Grey hair ... absolutely! With or without rear bike rack. Things like rear bike rack or filling my Dual fresh water tanks multiplied my problems. I've had a bike rack break and damage my bikes.
There are a variety of things I have done that brought the pendulum effect under control.
1. refrain from carrying water in fresh water tanks unnecessarily (instead carry portable water jugs in front of trailer when necessary)
2. Mount bikes on back of tow vehicle
3. Add friction type anti sway hitch attachment (I swear by this)
4. I added shock absorber kit from Orbital Machine Works in Texas. (this has more to do with reducing bounce on multiple bumps than the actual pendulum effect)
The result is safe trouble free towing where I am not having to anticipate trailer behaviour on downhill breaking, unexpected humps in the road at highway speed, turbulence from passing Semis. The friction type anti sway attachment should be a part of any formula you use. The result is total stability and ease of control.