I had a 2007 Silverado 1500 crew with the 5.3 the first year we towed our 26bh and I did not like the way it pulled. I never made it to the scales but guess I was close on payload with a family of four and our gear loaded. On flat roads, the combo was OK but when we got in rolling hills, the 5.3 struggled and constantly shifted gears. I drove white knuckled in the 1500 especially in moderate winds despite having a WDH with sway control and rechecking the dealer's hitch install. We never hauled with water in the tanks.