Get one with the packs, link it to dedi storage after its inventory is full, example metal, the metal will automatically unload into the dedi storage box. If you got multiple resources, you can auto unload by changing the link for each resource.
The resource attractor rig provides a base weight increase, as well as decreasing the weight of resources like Metal, wood, stone and crystal. Works extremely well with the excavation rig!
If your on singleplayer, go for one with an excavator rig. It’ll get you everything, and i mean it. It can harvest almost every resource in group gathering and it has a weight reduction for everything. Yes. Everything.