Assume you have a brand new Diesel or gas pickup truck of any brand and factory specs you choose. Assume there is a dolly connected to that pickup truck. How many of the same pickup/hitch/dolly combination trucks could the first truck pull if you have them lined up like a train (and the trailing truck are in neutral). Assume that 5 mph is sufficient max obtainable speed to be "successful." It's my last curiosity question...I promise. Is it a hundred or even 150 trucks or maybe even more!?