How much wear and tear

I drive a Euroline petrol truck 2.0l BJ 1996 with 115hp. I also use it professionally with heavy trailer. Now it happens every few months that you have to push a heavy trailer backwards up the mountain to get into a narrow driveway. The process takes 10 to 20 seconds. Unfortunately, the engine has too little power and the clutch grinds along (otherwise it goes off). After that it smells terrible … Do I really think that this stench from the wear of the clutch k How often does the car do such a thing? Is this a great wear and tear or is it mainly just a smell problem? How do you value it?