I guess my experience with Rancho's is more fortunate than DNewell's, mine have been on for 50 k + rears, fronts for 40 k miles, no problems. I tow huge loads and they're holding up fine - like wcjp said : enjoy the loaded or empty ride.
Tim, contact Rancho, assure them you're the original owner that bought them - they are the ones that warranty them, ultimately.
You can't blame the auto parts stores - they're just sticking to their policy. They would apply the Rancho warranty, IF you prove you bought 'em there.
[One tip: Autozone gives a 'free lifetime warranty' on ANY shocks, so recently my Ram Van blew out the front Gabriels (my fault for buying cheap to begin with... don't get me started... I shoulda never bought a cheap shock for a heavy rig!), they gave me 100 % credit against new front Bilsteins - cool !]
I do customer service for
www.PermaShield.net, so I've got experience here. In your case of no purchase proof, go to the manufacturer, not the selling store.
Now Rancho, if they doubt you, could ask for proof, but if there is manufacturing date code, and you can prove you owned the truck BEFORE that date, you are undoubtedly the 'original purchaser'.
I'd hate to see you spend the bucks if you don't have to... ...
Just my . 02 !
DB
in this case of a lost receipt)