During the final episode of Walking Dead season 6, Rick's party in the RV confronts numerous roadblocks set up by Negan's men, where the use of the bazooka would have been ideal, yet they never did. Why was this?
Why would they have had it with them?
Rick's crew were just taking Maggie to Hilltop they were not expecting various blockades to be set up in front of them by a group they thought they had already dealt with, and had the upper hand over the small band of Saviours (they thought were left).
Why would they have brought a Bazooka with them on something they considered routine?
The greatest threat they were expecting to face would be zombies, which they would be able to deal with armed as they were.
They probably kept it safe at Alexandria for an unexpected emergency situation.
In hindsight the Bazooka would have been great to have with them, and maybe they should have turned around after the first or second blockade, but they were confident in their abilities and later on they were starting to panic. They may even have thought the way back was blockaded as well.
Daryl shot one rocket at the bikers then another round was shot into the pond at Alexandria to start a fire for the walkers to walk into. When Abraham found the RPG, there was one rocket in it plus 3 more in the ammunition case, so they could've used it 4 times.
Sure, they weren’t planning on fighting, they were only going to Hilltop for Maggie, but they’d been running into multiple fights every time they were coming or going from Hilltop, so it wouldn’t be smart to not bring the RPG with them!