C.A.M.P Revamp was recently released for Fallout 76 - an update with a set of improvements and technical fixes.
One of them is designed to specifically solve the problem with "caravans". Players in Fallout 76 periodically encountered a critical bug that made it impossible to complete the route and complete the activity.
This problem was never fixed, but Bethesda offered a "workaround" - now the rules for issuing the reward are different and it can be obtained even if the caravan gets stuck:
"We are restructuring the tasks in "caravans" so that players receive rewards if the Brahmin stays alive, even if they cannot complete the route. Now the event will take a maximum of 7 minutes.
The "Caravan" event will now reward all players with the same amount of supplies, regardless of who started it".