- post on the RUSA google group that you're looking for a place to sleep on the route (I'd suggest being specific - "within x of y") and you might get lucky that somebody has an apartment or similar with an extra bed (or floor) space they're willing to share.
- You can overnight at the controls. Per the other post in this group, a bag drop service is being offered. You could get a bag taken e.g., to Loudeac and use it to have clean clothes, shower necessities, etc (pro tip: pack a roll of toilet paper!). The downside of using the controls is that you'll be vying with 8000 of your soon to be closest friends for bed space so if you're "on the bulge" you may have to wait a while for shower, bed, etc.
And of course you can always check the various lodging services (
booking.com, Expedia, ...) on a daily basis. A lot of people book rooms planning to go then change their plans and drop out for various reasons. You might get lucky.
It's also possible if you have support (someone with a car) to get lodging farther afield. Your support person can meet you at one of the designated controls (within 5K of the control according to the rules), take you to your lodging and bring you back the next morning. Per the rules of randonneuring you must leave/enter the route at the same point and note that the ACP is very strict about personal support vehicles (must be registered, can't be on the route itself, ...). If you pursue this option be sure to read the rules very carefully. It also goes without saying that you'll burn time going to/from your lodging so there is a point of diminishing returns versus staying at the control.
As to laying out the ride distances, that's highly dependent on you and how long you think you can ride. At PBP 2019, I was in group J (6:30 PM start, 90 hour time limit) and my ride was set up as follows:
- day 1: Rambouillet -> Loudeac 278 miles
- day 2: Loudeac->Brest->Loudeac 209 miles
- day 3: Loudeac->Mortagne 196 miles
- day 4: Mortagne->Rambouillet 76 miles
As things turned out, when I got to Mortagne at about 21:00, I felt pretty good and strongly considered continuing on to the finish. I ultimately decided against it since I had a place to stay near Mortagne plus the fact that I'd get to Rambouillet at around 02:00 with no place to sleep (I had a hotel room but not until the afternoon).
Based on that, it's POSSIBLE to just do a drop bag to Loudeac that you can access on the way out and the retour providing you have a place (or are willing to ditch nap on the floor) when you get to the finish.
Good luck!