Frankly I like 1:50 tractor trailers better than 1:43. A 1:43 Kenworth big rig is BIG! 1:50 trucks are still a lot bigger than 1:43 cars and not quite so overpowering of the scene.
I've converted a number of Corgi and Speccast to 'Streets. There is nothing as cool as seeing big rigs running on the roads. The UP 18 wheeler is my favorite: it is so good looking, and the cab still has its opening hood with model engine and opening doors and interior.
I failed utterly to puzzle anyone for long with the Pegaso a while back. Maybe this car will. It was made in much much larger numbers. I put it next to a Mini to show its size.