I would encourage you to put the air bags on. I tow a trailer about that size and did with a 1/2 ton. You don't know what you don't know but when you hit stretches as we did in Shreveport and Jackson MS I thought we would be thrown out of the truck due to the horrific bouncing - inside the trailer doors open, stuff strewn about and the sliding door to the bathroom completely tore out the track, strap an end of the facia. Next trip with airbags, and about 50mph (previously I had to slow to 45mph) we felt more secure and the door remained in place. Now, with HD truck, no bounce, no airbags, no loose stuff inside, no anything....just "peace of mind".