This is the 409 / 521 / 921 Bedford Articulating Truck. I got it for 10 bucks at a local toy shop. It was actually in very good shape, but had no tires and had been badly painted by someone. I took it all apart, repainted it and it turned out rather nicely.

 The yellow is not quite right as I think it needs a bit more of an orange tinge to it, but it is the best I could do right now. Perhaps some day I may try again. I was also lucky enough to acquire another one already stripped for a great price. Just needed to paint it the red version, add a front axle, and another wonderful toy is in the collection. You can see the before and after pictures below.