This was supposed to be a simple and easy (!!) painting, just a few elements, strong composition, knock it out in a few weeks, but it didn't work out like that.
The first truck I used should have been great but it, like the second truck, was grey, and was simply not strong enough to come to the front of the picture plane. It sank back to the distance of the sky and I wasted days and days changing its colour to bring it forward until I finally gave up and  changed the entire truck instead.
Then there was the yellow stripe. My original intention was for the stripe to be the width of the painting, but if you look at where it would have passed behind the truck you will see that a yellow bar through that junction created an impossible spatial muddle. Ditto making the brown shop red. Ditto continuing the red bar that runs across the top of the red building's doorway, dividing the larger windows of the brown building.
Then there was the problem of what exactly was inside the shops. The original photograph showed a huge muddle of graffiti and broken wall tiles and that didn't work. So, I boarded them up and that didn't work, so I made the walls gyprock and that was fine but the white flushing was too bitty and fiddly behind the window posters, and that got painted out quite late in the piece.
I had added a tree, but painted that out. An earlier figure had already been removed. Then the hula busker went in and his flowing loopiness led to the loopy graffiti, which could be echoed inside, thus convincing the eye that there was a continuous space behind the red wall. Then the piled up timber arrived, also opening up the space.
Then back to the truck. Ken did me a lot of diagrams explaining the relationship of what he tells me is an air filter and the exhaust. The back axle is a combination of the Truck and Old Woman's truck  and an ancient truck left in our paddock for a while by the share farmer. I doubt if it would work.
Some time during the last couple of weeks I realised that the bar with the numberplate on was way too low but when I'd raised it (quite a lot) and repainted all the stuff behind it, it finally, at long last, settled into place.
***  Here are some of the photos I used. There are more notes on Trucks on the Trucks Page.