2014 F150 SVT Raptor or 2015 Sprinter 3500 4x4 as tow Vhcle

From just a towing standpoint the Raptor just doesnt seem to be particularly designed as a tow vehicle , why not look at a f250 with 6.2 ? it would give you lots of overhead in towing capabilities compared to the Raptor & probably less expensive too, The Mercedes is going to be an expensive rig to repair and as an off road towing vehicle it doesnt seem very practicle either.