1. Have a bunch of guild members not in party sit with full haulers where land is going to be placed while driving the hauler.
2. Have someone else place land right where the haulers would be at this will cause the haulers to de-spawn with their packs still in the hauler.
3. Go across to where you want to turn in your packs in spawn the hauler full of packs.
4. Repeat
5. Profit???