One of my uncle's has an earth moving company, and has a lot of big yellow CAT toys. Its a lot of fun driving the big ones!
Another one is a builder who buys a bunch of them, he can run an excavator while talking on his phone and eating lunch!

He just got this monster Volvo thats almost to big to use.
When I was little I used to hang around the construction sites a lot, the Cat D8 was and still is my favorite dozer. I still remember riding in the D8 when I was a little kid, those things are beasts!