That is going to be really uncomfortable and probably borderline dangerous. Your driving 750 miles with 2 people on a bike? interesting. Those seats are not comfortable on long rides so you'll definitely be making a lot of stops, which means 12 hrs isn't so likely. Plus being the second person on a bike for any longer then an hour gets annoying and really uncomfortable. If your just one person on a bike it would be fine, but i wouldn't recommend doing two riders on one bike for that long. Plus on the trip from TX to IL you'll encounter a lot of truckers and fast drivers which probably wont be as bad as all those bugs and debris that will be coming at you lol. I would recommend just taking one of the cars, give it a tune up and give it a rest every 2-3 hours of driving. It would be safer then going on a bike that long.
