NOOOO! Thor buys Jayco

I don't think these large companies purposely let quality drop when they buy other companies, but the problem is that they become so big, that it's difficult to manage all of the operations. Rules and guidelines have to be standardized along with pay, hiring practices, etc. Once you do that, the quality employees are grouped in with the new hires and there is no longer any incentive to do good work.

Camping World is a prime example of this. They don't purposely do bad work, they just don't have any qualified technicians or can't keep them once they get experience.