I had to look twice at that cap,I almost went outside to look to see if mine was still there but I have the exact same cap in my back yard,same color,same mold,same size except that mine has the factory ladder rack on it.
Mine came off a Mazda long bed pickup.I have the keys to it and will give it to anyone that will bring four men to pick it up.
I loaded it on my own truck years ago with one other man but I would not try that again,it is a Reading cap and it is heavy.
It is a nice cap but I don't own any toy trucks and have no use for it. Ron G