Dodge Ram purchase advice

Meal, Since the leasing of my T5 is now slowly coming to an end and I have already been fond of a RAM for a long time I still have some questions that you can answer for sure here. It should become a RAM 1500 Sport MY 2018 as Quad Cab,Crew Cab would probably even like me better but then I would have to take Longbed (it is too long for me) to be able to drive the then to some extent safely as a truck (bin operator of a free car workshop)??? new tax classification, which is now measured according to CO2 emissions?? Thanks in advance Holger