I believe that 8'-6" is the max width before the load is considered a "wide load". On some smaller roads, the max is 8'. I recall that the paperwork that came with my cattle trailer indicated that its 102" axles may not be legal on some smaller roads. When you get into wide loads, the official requirements include wide load signs front and rear. We hired a guy to haul a dozer with a 10' blade. He agreed to haul it IF we agreed to pay any fines for the wide load. Traffic guys stopped and held the load until we went and purchased wide load signs. Permits may be required (revenue for the state). When you get to the 12' or so range, escorts might be required. I am guessing that you will be about 9 feet wide. Probably best to plead ignorance, haul during low traffic, stay off interstates and narrow bridges and away from weigh stations and take back roads and hope for the best.
Might want to use four chains instead of straps. My fear would be the tongue shifting side to side. Might want to screw some 2x6's to the trailer bed each side of the tongue to keep it from moving.
How you gonna get it on the trailer? If you back it on with a tractor, think about the rear of the baler being lower than the trailer. Rear may hit trailer before the tires get to the ramps. Low trailer and low hitch height would be best. May have to get creative on that. Once saw someone build a dirt ramp up to trailer height because of that. We will need pictures. Video even better. Good luck.