Not a car, but I'm hoping for a re-issue of the X-87 Flapjack. I always wanted one of these as a kid, but never got one. It would go well with the Fundecker Fokker they reissued this year. http://www.fantastic-plastic.com/Lemke'sFlapJackPage.htm
The Ranger was a victim of the "Chicken Tax", a tariff placed on imported light commercial vehicles (it was specifically targeting VW) in the 1960s in retaliation for European taxes on cheap American chickens. The US manufacturers were all for this tax at the time, but it has come back to bite them as it applies to US companies as well when they moved their factories out of the US. https://en.wikipedia.org/wiki/Chicken_tax
I've seen a number of 1-1 fire trucks built into car haulers. This one was built on a Ford C / Seagrave ladder truck but might be of some help for ideas. http://www.ford-trucks.com/forums/1395380-c800-fire-truck-to-car-hauler-conversion-is-complete.html
and another based on an older ALF 700 http://recoverynut.blogspot.com/2005/07/wierd-wreckers.html
If you want something different to haul, you could use it for hauling a drill team "truck" kind of a cross between a dragster and fire apparatus. It's an east coast thing, maybe even just a New York State thing? Nothing like this on the west coast.
Hard to say for sure as there are differences in resin wheels and kit mounting styles. You could get lucky and get a set of wheels that match up well, or you could get a set that require a bit of fabrication to make things line up. Also a huge variation on quality of resin parts, on the good end some are nice and crisp and can be mistaken for plastic parts from a kit, on the bad end you have to do a lot of clean up and reshaping, most fall somewhere in between. Couple different theories on prep for painting, soaking in Westleys Blech Wite (a tire cleaner) is one of the more popular methods. 5 min epoxy or CA glue (super glue) work well on resin and plastic.
KJ790 is a member here who casts truck parts, under the name Double Take Replicas. He has 2 and 5 hole Budds. http://kdhumphr.wix.com/double-take-replicas
There is a better photo of the built cab on the AITM site. I think you are correct on the issue but I think the issue is also there on the built up, just hidden due to photo quality / angle. Should be easy to fix. http://www.aitruckmodels.com/pages/ck97gmcdf7000crackerbox.html http://www.aitruckmodels.com/pages/ck98gmccrackerboxdaycab.html
Here is a short article with some photos. Looks like a rather simple scratchbuild to me. Just some tubing and flat stock with a little creative gizmology inside the tube. I bet ones of those disposable cones the doctor uses to look in your ears would work great for the insides. http://www.curbsideclassic.com/blog/cc-capsule-firestone-thermador-car-cooler-swamp-cooler/
I built the box from the floor up leaving the roof for last so I had access to the door mechanism. I don't care about working mechanisms like opening doors so I didn't bother with tape just gluing the door closed. Besides being more difficult if the door opened I would feel obligated to add some cargo. I cut along the grooves to separate the slats then glued them into place. I did this for two reasons, one the door where it curves into the top was putting a lot of pressure on the tracks, and second, the door looked kind of like a bent piece of sheet plastic, not a bunch of individual slats. Cutting the slats apart and then gluing them individually looks more like individual slats of the 1-1 doors, plus looking at the real thing is seems like they never quite match up 100% tending to get dings along the edges and a few just slightly out of whack. Still needs some detail painting and some weathering on the door, but it has been sidelined by other projects.