I ride a 2001 883xl and is looking at a 77 Superglide. How is the Superglide for highway riding? Can I maintain a speed of 70 75mph for a long length of time? Or will I burn up the bike? Is it a right move to go to that? I am 6´3´´ and 300lbs and is looking to trade my bike for the 77 is that smart as well? I am looking for any helpful info that I can get. thanks