Are there any guidelines on tires and age of them? The tires on my trailer are probably 6 years old now, but haven't had a lot of use. I'll be taking a long trip in September and want to be sure I'm...
You might possibly get 1 more season out of the tires in the condition they're in now (assuming they're not cracked and the sidewalls aren't split)
The time to start tire shopping and asking questions is now, so you're doing the right thing! Replace them as soon as you're confident that you've asked all the questions and have all the info that you need.