You can also use the wayback machine, http://web.archive.org
and search on www.thorca.com it will list years/months that were saved, click on an active year/month for your unit.
here is a sample link:
hereone other thing, on the inside of my under-sink door I also have a weight placard.
I looked it up for you:
here
Tahoe 21WTB Toyhauler
06 Dodge 3500 SLT, QC, LB, 4x4, 5.9, auto 370's
03 Kawasaki 360 Prarie
03 Kawasaki 300 Bayou
79 Honda XL 250
12 Honda XR 650