I was up into the mid fifteens fully loaded before I took all the Overland Explorer junk off my truck and rebuilt. Managed to shave 1k pounds. Truck runs just above 14 with normal loads (I have 70 gallons of fuel and 110 gallons water, so I quote weights at 40 gallons fuel and 70 gallons water).
Inches are the shock tube diameter. What was your final weight?
Earthroamer used to use 2.5 kings, and went to 3 or 3.5 I believe. I have 3" kings that are a bit too long from my previous coil spring suspension, so Im replacing with a shorter set of 3.5" shocks (might stick with 3 and just valve them stiffer. The volume of oil and orifice size etc increases as several multiples of the diameter increase. I'm a bit out of my depth here so dont quote me on these numbers, but just for example, going from a 2.5 to 3 might be close to doubling the oil volume in the shock. Basically, a small increase in diameter yields a large increase in the fluid available to dampen as well as the volume that needs to get hot before the shock stops working.