I was thinking of purchasing a cabover van truck like this to replace an aging pickup and open trailer. I like the large sides for billboard advertisement. We pull our loaded open trailers in the shop, now and there isn't any more room. So I could lock the van door and leave the cabover parked in the parking lot. This would save alot of shop space. It seems it would be more manueverable for the crews. They would take up less space than truck and trailer.
Disadvantages that I see: Where to dump the daily debris? Maybe debris bags. You can load your pruning clippings, tree limbs and debris in the back of pick up truck and then take them to the dump every day. Unloading mowers to fuel up. A little more time in the morning to fuel up.