can the Ford F 250 diesel I just bought really need a RCM, PCM and ABS with more

What is your question?

bought an 09 F 250 diesel and confess to know nothing about engines. The truck was driven on to a flatbed and driven straight to my house ( 48 hours straight) and then when the key went in all flashed ( lights on etc) but nothing else. shipper noted loose positive battery connection on passenger side but two days later at dealer and they took some time before telling me it needed an RCM, PCM and ABS and everyday it has been more sensors etc Now up to a 6,000 repair and because I don't know anything about this stuff its all a different language but have managed to find a few local indep diesel mechanics on the phone who seem to think the dealer may be scamming me or the tech just doesn't know what he is doing very hard to know if I am being scammed THANKS in advance for ANY advice before paying the bill