Can I get sued if I never get served papers?

Question Details:

I am an over the road truck driver and I haven't been home whenever the process server has tried to serve papers to me. My son didn't sign to receive them. Can they sue me anyway? I have a lot of medical bills and I already have a lien on my house from a credit card collection agency. Should I wait until I'm served to try and make arrangements or does it have to be before I'm served? I don't want another lien but I know that I can't pay them if they all come after me at once. Important Notice