I am not sure what the value of a side by side hay trailer would be. I guess there is a possibility that if someone has a flat 300 acre field and they want to bring all the hay to one corner. So, if you never get out of the field, then you wouldn't be breaking any laws. Any large round bale would be 66 inches or bigger, so that would be 11 feet wide, if you got them mashed together and that is illegal on the public roads. Even the small round bales at 4x5 would be at least 10 feet wide and that is illegal most places. I guess if you were hauling the small rounds at 4 or 4.5 feet in diameter, it could be legal, but if you are hauling those little bales, you probably aren't feeding enough cattle to justify buying a bale trailer, especially a side by side. The 70-72 inch bales I buy and haul would be at least 12 feet wide and I know of nowhere that is legal on a public road. I did see a demo video of a side by side 40 foot trailer that had hoops on each side and it self loaded and then raised and then lowered to drive away with the hay stacked. They said you could move 1,000 bales per day. However, you would only be moving and gathering and staying inside the same field, you could not go out onto a public road. Fun to watch, though.