Try looking for the Matchbox Super Rigs (or super convoy) series from 2007-09ish? The are near perfect! not true 64th scale, but not tiny 1/87 or 1/90th that you see a lot
I am finding this search frustrating. Currently there is nothing on the store shelves that fits this right. All the current Hot Wheels big rigs with trailers are over the top designs that just don't work. Match Box has nothing currently on the store shelves. There is plenty of them on ebay, but prices range broadly. I found some nice 1/87 HO scale ones at the hobby store that are a decent length, but they still look a tad small because they are scale accurate. I found two on ebay that I am in love with and would work very well, and of course they have to be rare and expensive. One I may cave and get, because once you compare it to some of the resin and plastic miniatures I have bought for games its really not that bad. The other one is just too rich for my blood. Especially since I plane to paint and distress it.
So I keep hoping maybe I will get lucky at a flea market or yard sale one of these days.