I don't think it has a serial number plate. If it does then I'd add maybe a thousand. If it doesn't have a serial numbered plate then price it as a SLT with whatever options it has. Because that is pretty much what it is with decals. Hopefully someone will come along more knowledgably about the truck.
HemiGTX - The Hemi GTX package is a limited sport-truck version of the Ram. Introduced in 2004 and only made in 2004 and 2005, these were customized by LA West of Indiana as ordered from dealers. It was available on regular-cab/short-box and quad-cab/short-box pickups and include a custom overall paint from Mopar's Impact colors from the 1970s (this includes Hemi Orange, Plum Crazy Purple, Sublime Green, and Banana Yellow). 20" American Racing Motto chrome wheels, a new cowl "blacked-out" hood, and a specially trimmed leather 2-tone interior including a serialized number plate on the driver's-side doorjamb were offered. On the sides is a "hockey-stick" stripe with "HEMI GTX" that extended from the hood to the rear of the box. The air box was also painted to match the body color, and a color-matched steering wheel was added as well. They were only 433 produced in 2004 and roughly the same number in 2005. A certificate of authencity was given to all original owners.
I've seen it in some responses where they say the add-on package had about $10K worth of extras but it still sold for roughly the same price as a regular new Hemi of the same year - I don't know about that .
'Doc' "Christians Aren't Perfect - We Are Forgiven"