Jeepers92 wrote:
I have same truck with 4WD. I also have a Fox 811, which is almost the same as the 990. I would not think you would need any mos to the truck. Only problem with the fox was water intrusion around clearance lights.
The older model lights were unsealed along the bottom edge to let water drain out. However, water could be forced in while driving in heavy rain. I converted to all LED outside. I'm now fully sealed at all outside light fixtures.
To the OP, recommend Torklift StableLoads. That should be enough or at least a great start.