I used to carry one model on front of my scooter and one on the rear now I no longer need to travel by train I purchased a bicycle trailer for carrying a child fro Holland via ebay the instructions were in Chinese/Dutch translation so bad my Dutch brother in-law couldn't under stand them. And converted it to carry 2 possibly 3 models as the pic's show 3 is a squeeze.
Very pleased with it as seen in the pick didn't even feel it whilst towing.
I removed every thing bar the frame which narrowed 6" so that it fitted between my shed and the unit, I then welded 2 lengths of 25mm angle and the original front mount for the Sub chaser..
I'm considering a second level and frames for my yacht and catermaran.
I haven't been totally idle & wrapped up in Dr's appt's.