Your trucks RAWR is 6200# (max weight rear axle can carry....truck weight on rear axle plus 5th wheel hitch weight)
14K 5th wheel wet pin (trailer loaded up camp ready) will add 2900# to trucks rear axle
That will put you close/right at Trucks RAWR of 6200#
Pismo.....Lots of 5th wheels/Toy haulers etc out there
Tires will have to be aired down and pay attention to high tide

One thing...with 5th wheel GVWR under 15,000# you do not have to get a Non-Commercial Class A license that CA requires for 5th wheels over 15K (also required if Travel Trailer GVWR is over 10K)