I just came from a Road King TO the LT. Mine is a 2003, and I'm super satisfied. My road king at highway speeds would get 100 miles per tank. (70-80 miles per hour) and I could only bear to sit about that long.
My K1200LT gets 200+ miles per tank (70-80 mph)
My harley was such a dog power wise, and the lt is not.
You have more storage with the LT, you have heated seats and grips, and a trunk. You have a sweet radio, and cruise (depends on year of road king for cruise)
The harley would literally rattle and run with such high revs at highway speeds, it wasn't comfortable.
The BMW feels like floating on air with a radio blasting at highway speeds.
I felt like everyone had a road king and it kind of sucked.
I feel like more of an individual with a BMW... and most people think I'm "Rich" now.
road king will last around 100,000 miles if you're lucky
BMW = 200,000 - 300,000... just ask some people around here.
Most all of the gadgets that you'd pay for on a Harley comes stock on a BMW. (radio, windscreen, heated grips and seat, etc.)
But it's all up to you. only you will know if you'll be happy on one or not