How can Forest River claim the Wildcat Maxx fifth wheels are 1/2 ton tow able. According to their specifications depending on floor plans the GVMR ranges from 11,590 to 11,960 lbs, the UVW from 8,431 to 9,353 lbs. Please inform me which 1/2 ton could safely tow them? I have a Chevy 2500 HD...