Agree with APT—tow with what you have. Lock out OD and only drive 55 mph for safety and transmission life. I towed with 97 F-150 4.6 pulling 6000 lb trailer and 600 lb. 4 wheeler in the bed. Felt safe, but took it slow. Because of the length of the trailer be sure that you have a WD hitch set up to slightly drop the front bumper which will put approximately the same weight on the front axle for proper steering. Also, must have sway control. Good luck. Remember that an F-250 truck with a 5.4 engine may have more towing capacity but won’t go up the mountains any faster. Don’t rush into a hurried decision in the next 4 weeks. Ignore the guys that say you need a dually.