My humble suggestion is that you use the GVW as a guide rather than the basically meaningless "dry weight" that the sales folk love to use to sell an RV. Although dry weight is easily found and often quoted the GVW is on the unit and is much closer to real world weight. That being said , there are several TT's that gross in the area of 7000 lb that might fit the bill. I looked at a 2010 (used) North Trail in Sept that was a bit shorter (26 vs 29) but otherwise fit your specs so they are out there. I went new as it was the same price up here in the north country.
Ian & Lyn. 2011 white Scab F150 4X4 ecoboost with max trailer pkg...now towing a North Trail 21 FBS .