Here is the service schedule . . . http://www.neuwirthmotors.net/ram-service-schedule.htm
There are plenty of drive-thru oil change places, takes 10min and about $60 for oil and filter, so that going to be every 8k km. other than fuel . . . there is no Tax or MOT. So running costs that about it.
I will be getting some proper winter tyres ($1200) nerf bars on the sides and a tonneau cover.
Might go see how much the black inserts are