Trailer has sat awhile, should I be scared about my tires?

"IMO the greater issue is age, not regular use."

While the above comes from a very knowledgeable person, I would say this is not entirely true. IMO, a tire that sees regular use, will fare better than one that sees little use, considering both to be the same age. I believe running the tires often, helps to prevent premature cracking, in tread and sidewalls.

Jerry