Humidifier for semi truck

I am picking up my new guitar from GC today. I drive a semi and I do have issues with humidity in the truck. My heat source is a very dry heat, dry skin etc. Should I get one of the guitar humidifiers or should I get just a small room Humidifier, which I probably need anyways even without a guitar? I am leaning room Humidifier but I thought I would ask. TIA