Getting back the main topic: travelling solo!
I travel almost exclusively solo as I have abundant time, and the time to get south is at least 2 days plus, so I tend to dovetail trips together for longer periods. Few can take off for 1-3 months or more.
One the main reasons I joined this forum and a few others was to meet up with folks for various portions of my trips and this has worked out great. I have been lucky to meet up with a great bunch of people, made new friends and hope to do more trails in the future with them again.
As my trips can be length, I need time to organize these and ask for participants usually several month in advance as some portions are a week or more in length and people need time to schedule that in their life (work, family, vacation, etc.). Some show interest early and then can't make it (that's OK...I understand other priorities), some are into it right from the start and then bail (that's OK too, things happen!). But all I really want is for a few (say 3-4) to come along, to have some fun, new experiences, solve some worldly problems verbally, etc.
I look at it that there are places I want to go, see, explore and I want to get them in while I still can, things change. Health for one, priorities, family, interests and then there is the outside influences, regulations and closures.
Back to travelling solo: Scout's motto for sure applies here! Good maintenance and weighing risks, also play a critical role. Lastly, your driving skills and what your rig is capable of play the ultimate role.
Solo (just you - no GFs, spouses, etc.) travel is great at times, but I find that when I do travel solo, I tend to travel more distance in a given time period simply cause there isn't anything else to do and I travel late into t day just so I don't have to sit around waiting for sleep to take over. Exploring is more fun with someone, fireside chin-wagging is more fun with someone (I hate it when I answer myself as that means something is really wrong, LOL).
I can only stay at a secluded beach in Baja or a kool camp site in the desert for so many days, after which I get bored and have had enough time to myself. Small town cantinas, tavernas, pubs, etc. are only fun until the first ale or two are down, then who do you talk to? The bartender can only offer so much to the conversation and then what?
Suggestion: Since their are so many solo adventurers out there (>50% by Scott's estimate) let's see if we can get together in the future and do some trips with each other.