Yeah, the SRT isnt rated, they never are, except the Jeep, I think since that rating process would require testing that would jack the price up, and every penny counts when your trying to beat the 60-70K car crowd with only a 40K car.
The 5.7 is rated for I think 3500 and 300 tongue. Since the 6.1 has as good or better equipment than the 5.7, I use 3,000 and 300 as my limit, but dont expect I'll ever do more than the 1600 + trailer, which puts me in the 2,000 and 200 range. I know Dale Seeley and others who have run the SRT-4 in the One Lap have towed trailers with no issue.
Back on topic, got my tags for the Wee today!!!!!!! (The V stroms come in tow displacements, the 1000 and the 650, also known as the Vee (1000), and the Wee (650).