Back problems common in trucking?

I'm planning on getting into the industry soon, but have somewhat of a sensitive back. Are back problems common among truck drivers or are the seats comfortable enough and provide enough back support to help with back issues?

I plan on doing lots of stretching anytime I can, but sitting for hours at a time can be horrible on your back, just wondering how it really is.

 

Does no one out there have any input on this subject? Surely someone has had back pain at some point and made some change to their seat or position to help.

Anyone?

Thanks

 

Thanks very much for the responses. I figured they would make the seats generally comfortable if the people they are paying are going to be sitting in them for such a long time. Sitting on a milk crate doesn't make for happy employees.