No real suggestions, just move faster. When I unload our line is always backed up and I'm frequently waiting for the line TMs to get product off. When someone else is unloading our line is often so empty that we're frequently waiting on him in the truck. It's all about speed. I try to stack like boxes together that I know will be offloaded onto the same uboat. For example, I might stack two boxes of contact lens cleaner on top of each other if they were stacked together on the truck. Takes a second or two off the unload.
In my store the off load frequently takes two hours or more. We have a unloader, one talking off boxes on one side and another taking boxes off the other. One detrashing sort lines. It's incredibly boring and I hate how slow it is compared to the times when we had two in the truck and 7 or 8 on the line