Many expected Red Dead Online to be a copy of GTA Online in a Wild West setting, but Rockstar added a few quirks that made it fairly distinguished. For example, the camp behaves like properties in GTA Online but it can also be upgraded.
Players could purchase properties in GTA Online in order to house their vehicles and have a safe spot for themselves, on top of using them as respawn points. One of the key differences between properties in GTAO and RDO camp is that there is only one camp, while players could own several properties at the same time.
On the other hand, as soon as players pop into RDO's camp, they are handed a catalog that details possible upgrades and customisation options. Technically, properties could be upgraded in GTAO too, but the upgrades were linear and mostly revolved around cosmetic differences and additional car storage slots.
This is also one of the rare spots in Red Dead Redemption 2 where realism goes out the window, despite Rockstar's extreme care for details. Players can whip the catalog out at any time, anywhere and order upgrades and customisation options for their camp, even while stuck in the water. Pages will be as dry as a barrel of gunpowder, and you can order anything you like, provided you have the bucks.
Then again, players will be able to fast travel to several places in Red Dead Online and with up to 32 people in the place, things were bound to get weird at some point. GTA Online was a great example of the zany events players organised themselves for, well, themselves.
Rockstar also pulled a fairly smart move here too - if, or more like when, they incorporate microtransactions, parting with money might come easier for players through the catalog. It may sound silly that immersive UI could drive players to spend more money, but it's at least one layer of a system made to make those microtransaction juices flowing.