People on this forum crack me up. Really, he's going to get his 5600lb trailer up to 9,000lbs? I don't even add that much cargo wight into my 38' 5th wheel toyhauler with a 130 gallon water tank. I live in CA, have traveled the same areas and used to have a 2007 F-150 with the 5.4 V8 (hence the user name). Any relatively new F150 with the V8 or Ecoboost and the Max Tow package will easily haul that trailer. Period.
A 3/4 ton would obviously handle it even better but you have lower mpg, a worse turning radius, and in CA a much higher annual reg fees. Their rocker panels are about 4-5" higher off the ground so they're mildly harder to get into but by no means is it a chore.
