need advice on replacing tires and first weekend trip report

Your tires will have a date code on them. Search the forum and you will find the decoder. Tires will age out before wear out if you are not on the road as a full-timer. Sun is your enemy as well. I had a blowout on a 4 year old tire that I am pretty sure is sun related. You probably need to replace the set including spare.

I inspect and repack my bearings every year. Some say that is overkill and they've always been fine but I feel better, especially before a long trip.