I just had my toad (09 Ram 1500) weighed on all 4s as we carry a pretty heavy bike in it and I do want to inflate the tires more accurately than my guess. The truck has Michelin Defender tires and I can't find anything on the Michelin web site regarding inflation charts. Now I think I remember several years ago having the same issue for the same reason (same truck but different bike) and Michelin said in a "chat" that they don't publish them anymore. Is my memory wrong, or if not, have the l