the situation is highly unlikely.
1 may be bad...or the boots may be torn on some/all of them. That doesn't mean they are "bad"
Do the prybar test.
I wheel mine pretty hard (i've got some air...sadly) and I'm on 33's and spindles with my bars cranked about 1/2 way, actually less. And mine tested perfect. Although I am still going to replace them (b/c I want to upgrade to 37's soon enough) so I'm doing all my upgrading before my tires get too worn so I can sell em for some decent $
IMO, go to another shop and get a 2nd opinion, maybe even a 3rd before you drop 300 on a set of moogs
08 Cummins Mega Cab, 7" on 37
02 Explorer Sport
08 Brute 750 on 29.5