24/12 is ace for soloing, the course is set up so there’s masses of trackside access. Take a table and simply stick it and your tent along the side of the track. Bottles, food etc on/under/near the table, roll in, dump old wrappers and bottles, grab new bottle and fuel, roll out, sorted.
That’s what most people do and it works really well, no temptation to limp off into a marquee and mope around wasting time 🙂
Edit: yes, you can pop off over the ropes at your pit-stop then get back on the course at the same spot no bother. You just pass through the timing thing on the start finish straight once per lap, the rest is just common sense. In real life it’s very straightforward.