I can comment on the Harley's I ride, my 04 Dyna FXDXI and 09 Electra Glide Standard. Most longer rides were solo with camping gear. My experience has always been very positive.
The longest Dyna ride I did was in 2006. The bike was stock other than removable bags, Corbin Solo seat, driving lights, and a small rear rack. The exhaust was stock but the airbox was replaced with a freer flowing one. I was able to stow some items on top of each saddlebag the rest in a Dry bag across the back. It was my first longish ride on any Harley so I wasn't exactly sure what to expect. Turned out nothing unexpected occurred. It never missed a beat, nothing vibrated loose, at 3,800 miles the oil level was still above "add" but I topped it up with 16 ounces, power was adequate and remained so at higher elevations, gas mileage was usually around 40-44 dipping down to the mid 30's a couple times against a head wind. Tire mileage is around 7,000 rear and 10,000 front.
I took the E Glide on longer rides to Wyoming in 2009 and through Arkansas in 2011. It is stock other than the airbox. The stock seat is quite comfortable, actually one of the few I’ve not replaced. It also has a rear rack which made it easy to strap a couple Drybags on, one on the passenger seat another on the rack behind the backrest. This keeps the weight lower and more forward than a tour trunk. The Dyna was fine but the E Glide was more comfortable, roomy, and relaxed feeling with it’s nicer seat, floor boards, and tall 6th gear. It was quite relaxing to set the cruise on 75mph and just sit back and listen to the engine loafing along at 2,900 rpm for mile after mile across Nebraska. The batwing fairing offers good protection yet allows plenty of air. For some reason I get a lot of resonance and noise with a full face helmet but a 3/4 helmet is quiet, so that’s what I wear on this bike. The only time I find it wanting for more power is when passing at higher speeds. The Brembo brakes work well and the 09’s+ have all the cornering clearance I need. For tire mileage I get around 10-11,000 on the rear and 13-14,000 on the front. For reference on my R1200GS I typically got about 6,000 rear, 8,000 front on regular Tourances. Like the Dyna it never missed a beat, the belt needed no attention, again I added about 1/2 quart of oil at around 4,000 miles which is about what my R1200 would use.
