I don't mind long OTAs, but I try to space my rings to "cut" the OTA into thirds (ignore the dew shield). Then I place this on a mount (and tripod) that can carry more than three times (3x) the weight of my OTA and enjoy a stress-free, vibration-free night. The picture below is a sub-20 pound f/8 FS-128 on a 65-pound capacity Mach1. This all sits on a 250+-pound capacity Eagle Pier.
My Dad taught me the value of a good mount when I was in high school. A good mount makes everything you do in astronomy - visual or photographic - more fun and more productive. The most expensive (and Best) investment I ever made in astronomy was this mount more than 12 years ago. It has never been stressed and has performed flawlessly for me over the years. It can safely carry anything I can lift.
That is certainly a nice looking rig.
In my mind, there is always a balance between the capacity of the mount and the hassle/difficulty involved in setting it up. For me, I would probably never use an 5 inch refractor on a Mach 1 because it would be more hassle to setup than something larger that is more capable. Even with the 120mm Eon that I got from you mounted on a sturdy ALT-AZ mount, that's a major issue.
The rig weighs 34-35 lbs complete and ready and I can carry it out the door assembled and ready, even loaded with eyepieces. But I enjoy splitting close doubles, a 120mm is better than a 4 inch but not by a lot. A 10 inch, which is not much more effort to setup, is better than the 120mm and by quite a large margin.