... I find it hard to understand why real trucks should not have automatic transmissions.
I think it's just an opinion,
Because the opposite is certainly true as well.
For example take a look at
these two Heavy Haul trucks that recently moved a 120 ton transformer just around the corner form me. Both had automatics, and by any definition you choose they are without a doubt "real trucks". Here's a picture for scale
http://rides.webshots.com/photo/2988772320080251109wFbwXBAnd to further support that "real trucks" can have an automatic take a peek at
what Allison has to offer for commercial trucks. Grigg