IKEA Canada has these cabinets: http://www.ikea.com/ca/en/catalog/products/00282250/. With 3 shelves, roughly 27" wide by 7" deep by 9" high, there should be room for the Mitsubishi car carrier and up to 4 shorter trucks. Of course I've got 6 shorter trucks, plus the Freightliner which doesn't have a trailer yet, so clearly I was going to need two.
So I went out and battled the Easter Monday shopping crowd and picked up two. They go together well and they look good in solid pine. Shelf depth inside the doors is 6-1/2", shelf height varies from just under 8-1/2" to almost 9", but the inside length is only 26-3/8", likely almost an inch short if I want to fit the Mitsubishi tractor in there on the same shelf as the carrier. Presumably the Freightliner with the upcoming Revell car carrier will be even worse. However it is better than what I had, and opens up space to buy and build more stuff. Most cabinets, at IKEA or elsewhere, are made for showing off Grandma's serving dishes and are therefore too deep. These are a very nice solution if you've got lots to display; with a bit of handiwork you could add three more shelves and get 13 feet of linear display space suitable for vehicles under 4" high.
As I keep telling the kids, I could be spending their inheritance drinking, gambling, smoking and chasing women in bars, but I'm not, so they shouldn't complain about the occasional kit and associated impedimenta such as cabinets.