I would highly recommend against this with that size of trailer. If you want to go gasser, try finding one of the V-10's from Ford. I would not pull any of the larger 5th wheels with anything less. I pulled my Cat from the dealer to home with my 5.4L F-250, and immediately started the hunt for a diesel. That is just too much trailer for what you are looking at.
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!