Welcome, Shadowfax. We older guys ask dumb questions, too, so don't feel lowly. Also, be sure to visit the thread http://www.mightyram50.net/vbulletin...and-do-it-ASAP for some pointers on preventitive maintenance. The worst thing these trucks have been subjected to is lack of proper, comprehensive maintenance.

I had very good results using an upholstery cleaner attachment for the carpet machine in getting the headliner clean. I caution you that its base material is egg-carton fiberboard, so be careful not to soak it or it will turn into oatmeal. It pops out fairly easily (you have to remove the rear-view mirror and sun visors) once the plastic rivets are out if you want to cover it with material or even paint it.

Enjoy your little truck: give it the full measure of your attention and it will reward you with some very wonderful motoring.