Unless the previous owner took the badges off, there should be those trim-level badges (JX, JLX, etc) next to or part of the Samurai (or Sidekick) name badge. If your truck is plain-jane like mine, then it just says Samurai (or Sidekick).
The VIN will reveal in it's own cryptic way exactly how your truck was equipped as it came from the factory. Do a search for vin at Ack's FAQ (link in siganture below....) for general information on how to decode VIN numbers.
Hope this helps!