I am operating a 2016 F350 Dually 4x4. The as built weight capacity rating is 7450. The Eagle Cap 1165 I have is showing an as built dry weight of 4800.Loaded with a half tank of water I weighed 60 pounds under GVWR. The upgrades include Air Lift 75...
Most of what you are asking is personal preference based on experience.I setup my suspension to handle the load and the road and the dirt.Don’t go cheap!
I had to replace two of my jack motors last year. They quit working.You can just take it off and plug it into a different location. It is a very easy process and will take about 30 minutes. Good luck!