Yes, you can, but you will need to trim (or fold it over is my preference) the steel part of the rear arch where the door closes, right up to the top at the door gap where there is a small bolt which likes to tear chunks out of your tyres. The rear of the rear arch should be fine...
Front wings you will need to trim the bumper end caps and the wings behind them, you will probably get away with not trimming the rear of the front wing -I managed to just fold mine over a bit, and being a silver RRC, the ali doesn;t show too much through it Yours... being black might need a squirt of paint to make it presentable (if you care about that!) You may also need to trim the sill cover strips, although if you plan to go off-road you are probably better taking them off anyways.
^^^ That's my experience fitting 238/85s on 2 different Rangies, both had the same symptoms.
Oh, and nice truck btw