A properly equipped (please note the "properly equipped) 250/2500 will work if the GVWR is 14,000. However, I would recommend at least a 350/3500, and as mentioned, a dually would be the best for stability. The F-450 by Ford actually has a tighter turning radius than the 250/350, but it does have a wide rear end! If I were pulling a lot, I would probably opt for the F-450 (me being a Ford guy), but in my current tow mode (I'm a weekender...weekends here and there with an occasional long trip), for that trailer, I would probably opt for a 350/3500.
By the way, you actually did it the right way by getting the trailer first. Now you can get the right truck for the job.
Ed and Sharon
2010 Wildcat 28RKBS
2011 Ford F-250 XLT, 6.7L PSD
Ride-Rite Airbags and Airlift wireless remote compressor...nice!
I thought I was wrong once, but I was wrong!