ProdeX, I took a look at your other videos too. All of them look nice.
I just have a question: do you use double or triple axle dump trailers (with the axles closed to each other - we call them 'semi-trailers')? In the video I've noticed a tractor sometimes sticks in the mud when pulling heavily loaded trailer(s) if it's wet. A tractor pulling 'semi-trailer', has additional load on the rear axle and mostly avoids some mud sticking (with the weights at the front indeed). Well... not always, but.
Example: Turines Priekaba Nuotrauku galerija - BULKLOADA