Well my vote is for the f450 and an open trailer....
-F450 can haul, and pull anything
- Maintanece isnt very much in the long run
- open trailer can pull equipment and extra brush/ material
Your current truck couldn't even handle the full capacity of a 10k dump trailer. The 7.3's in the 00's-02's are known to run forever, and aren't short on power, good luck