Hmmm, normally there's some sort of manufacturer tag on the off-door side of the trailer with some of that information. Sometimes it fades and get's a little difficult to read, but maybe something on there will help point you to the right direction. We had a tough time figuring out what our hybrid model was too, but after I found that metal plate and wiped it down with a moist cloth, I was able to read the M-18 ink stamp on it, barely.
Ok, so after looking at the nada again, apparently there is a Forest River - California side of things with the Salem Sport listed in it. I think I've narrowed it down for you to one of these 3 models - SALEM SPORT FIFTH WHEEL SERIES
M-26SU - 30' x 8' M-30SU - 33' x 8'
M-37SU - 38' x 8'
Normally, they include the rear bumper and the hitch (for bumper pulls) in the measurements, so you might have to extend the measuring tape a little longer to see which one of these makes more sense. When you have it, here's the link the page for the NADA:
RV 2000 FOREST RIVER-CALIFORNIA Travel Trailers Fifth Wheels prices, specs and options at NADAguides.com
Notice the Brand on it was "Forest River-California"...new one to me???
Hope that helps ya.
Where we've been:
2000 Rockwood Roo M-18 Hybrid
2006 Dodge Ram 2500 Auto 5.9 Diesel
Gone but not forgotten -1986 Rockwood 1003 PUP