I am a Herc load. There are some situations that exist where it would be appropriate for the loadmasters to ask the front enders to raise the elevators during loading. It is not common though. Been doing the load thing for 13 years or so with multiple deployments along the way. I have only had to ask the pilots to raise the elevators once. In my case, it was the loading equipment in Uganda that they were using and not the height of the cargo that was the problem.
For the non Herc folks on this thread, it is in the AOR regs that you can't have a 25K K-loader behind the aircraft and use a forklift to load additional pallets on the aircraft. You have to bridge two 25K K-loaders together and load that way. Here is what that means. A 25K K-loader is capable of moving 25,000lbs of cargo. It can only hold 3 pallets at a time. An H model Herc can hold 6 pallets and a stretched J can hold 8. The 25K is short. When it is behind the aircraft, it doesn't go out past the tail. Some loadmasters were using a stationary 25K K-loader behind the aircraft and then loading the rest of the pallets using a forklift to load pallets onto the K-loader and then just pushing the pallets across the K-loader and onto the aircraft. The problem was, while operating the forklift to load pallets onto the K-loader, the cargo on the forklift had the very real potential for hitting the tail of the aircraft because the 25K doesn't extend out past the tail. So again, the local regs prohibited this. These guys were abiding by the regs. They had two 25Ks bridged together. So, sadly, there was no reason to have the pilots hold the yoke back. I don't want to speculate, but my guess is that somebody tapped an elevator with a pallet and the unit fried the loadmasters publicly. That would cause them to be over cautious.