hey tom,
I have a mitsi. L200 crew cab ( '07 ). Using it now for the past 3years. It has an enclosed lockable cab / canopy on the back with tinted glass so secure enough. I carry a 350 Ltr. flat tank, Di vessel pump & controller etc, 3 x WFP's, internal poles, buckets, hose reel, tools a lot more bits & bobs. On the roof I carry set of steps and a 25 ft. ladder.
This all does me for general window cleaning, gutter work / pvc cleans etc.
When I'm pressure washing I pull a 6 x 4 trailer - this has 2 x pressure washers, lances, hoses, drums etc etc.
Point is this type of vehicle suits the tasks very well and also has the benifit of the rear seats for dropping kiddies off to school / ball etc. Haven't been stuck yet!
hope this is of help and not too boring - Ray