How do you replace all the tires on a 5th wheel?

For the most part, Les Scwab has done me right for bearing re-pack and TV tire issues. However, my last visit I got the guy that must have been his first day. When he rotated my dually tires he mis-aligned the stems so I couldn't put air in my tires. On the boat trailer bearing repack, he put too long of cotter pins in that over heated my bearing buddies which ultimately blew a seal. I'll be more thorough in my review before driving away next time.