4-5K trailer? Another vote for a half ton. Had a 16' double axle flatbed (removable racks) for the past 14 years and thru three different GM half ton 4x4s.
10K max load for that trailer and it doesn't matter if there's a tractor on it, or 2.5 cords of fire wood. All three 5.3L trucks have snatched it along with no issues. Drops the highway mileage from 20-22 down to about 12-14, depending on the load. Plenty of go for coming back from the mountains with a jag of wood on it. Also have an 8' steel sided box trailer that I can haul a Farmall Cub on, or a cord of wood. Don't even know it's back there.
Fetched one helluva mess of oak butts home this fall, on a buddy's 14' dump trailer. Closer to three cords, than what I can tote on my flatbed. Nary a miss. Damn near everyone I know that has been driving diesels for some time, is happy with the newer ones.
