You have to be 150+ km away to can warp to an object or bookmark so will not be possible if the fleet travels together and even if not there is no quick way to get hundreds of kms from the gate.
Also I already was thinking about this and as a result I’ve pointed out in my post the gankers can have the advantage (if they bother to) as their fleet of cats along with a thief can warp to the target meaning their hauler can be within looting range right away so if you try to warp to the wreck (even if somehow already far away to can warp) it will take too long for you compared to the ganker hauler.
Gankalysts are also used to kill mission runners, explorers and combat ships in general it is just a matter of enough DPS.
The problem is each time a ship is destroyed (with the cargo inside it) there is a 50% chance for each item stack to be destroyed, thus if the ganker hauler is destroyed that is another layer of losses from the amount of survived cargo from the original hauler exploding which already was a layer of losses.
The best is to grab the loot first but if the gankers are not lazy you already have a disadvantage there to begin with as explained earlier in this post and my other posts. So as grabbing the initial loot drop first (from the original hauler exploding) might not be possible unless extremely lucky the next best thing is ensuring the ganker thief hauler is popped. After which there is a much better chance to grab the remaining loot.
As the same empty hauler can be used for this as well not much is different, if can the empty hauler grabs the loot but if unable to do so then a combat ship capable of tackling is also very useful and at least can prevent the ganker thief hauler from escaping (even if the loot might get destroyed or most of it in the process) and if some loot survives the empty hauler can grab that and hopefully escape with it.