It would be helpful if you would pick your trailer first, then you will know how much truck you need. You say 14k is 'not very much'. How much trailer are you planning on towing? At that weight most folks here will recommend a 1 ton diesel, likely a dually. You are talking some serious pocket money for a new large 5th wheel and new diesel.
A different question might be to specify a budget and ask for recommendations on the best combination for the $. For example the Ram 2500 with the 6.4 is very capable and I have seen some pretty good deals on them new. That would leave more money for the fifth wheel provided you don't go too large on the fifth wheel.
Good luck,
Stu
