You saying put a receiver on the utility trailer, then pull the popup behind it? or the other way around? That sounds dicey either way..
or by pull two trailers are you saying just take 2 cars. That's more realistic.. and for that one trip this summer where we need all the bikes and the camper, probably most practical.
The utility trailer is 5x10, yes it can easily do 2 bikes in front facing forward, and third in the middle facing back.