I did not have to drop the tank, but probably not for the reason you are thinking. I have made an easily removable (approximately 14"x14") section of the truck bed for easy access to the fuel tank module.
However, I don't think it is necessary to drop the tank to remove the rollover protection valve. The rollover protection valve is located in the forward part of the fuel tank module. There is nothing connected to it. The left side of the photo represents the front of the truck.
View attachment 136696
Mine used a wavy washer to hold it into place. To remove it, I pressed downward and simultaneously rotated the valve 90° clockwise and lifted it out. I think there are other methods to hold them in place, as well.
- John