I ride with a friend who is well over 6' and 230 pounds. He looks fine on the bike and loves it.
As for freeway riding, I do it quite often if I've got to go a long way (50 miles or so) and am in somewhat of a hurry. I cruise between 60-70 depending in the traffic. My fuel consumption drops to about 68mpg when I do this. Trucks haven't really been much of an issue except when the road is taken up by them and I'm not real hot about splitting lanes between a bunch of them. Not that I haven't. I don't particularly find the Enfield any more susceptible to their turbulence than any other bike I've owned, but I've never owned anything that weighed over 550 pounds. Basically, I find the bike a quite capable freeway runner, but just stick with the slower lanes, unless they are all slow, then it doesn't matter. I have 5000 miles on my 2011 Classic G5 and have pretty much ridden it on any paved road you can imagine, and a few dirt ones, from sea level to 8000 feet. It has performed very well in all occasions, certainly within the expectations one should have for the bike. If you ride it within it's capabilities, you will love it. If you expect to grab a handful of throttle and get to 100mph in a blink of the eye, you will be rather disappointed. People have ridden bikes in this performance category for 80 years and were always happy with them and they will get you to some amazing places. the RE has so much to offer in the sheer joy of riding that is not shared by other motorcycles, it's just unexplainable. As the old saw goes, "If you have to ask, you'd never understand."
Bare