I also have a short bed F350 pulling 13,000 lb fiver. I had a B&W turnoverball installed in truck. This will provide for a 100% clear bed when not towing. I then had a Reese Goosebox installed on trailer. I have had 3 fifth wheel trailers pulled by Ford trucks and this is by far the most secure and comfortable towing setup I've ever experienced.
And FWIW, an earlier poster said the 6.7 powerstroke is no Cummins was correct. The new powerstroke will last just as long, and will drag that ram Cummins across a Walmart parking lot. he he
2016 Ford F-350 Lariat CC, 4x4 SRW. B&W turnover with extender. 2015 CC Silverback 29RE, fitted with Reese Goose Box. Amateur Extra Class K5TS, 2016 nights camped 16