I just got a new chevy with the 5.3 V8 to tow my 21ft toy box. Hopefully this tows better than my V6 tacoma did. Trailer weighs 6500# when loaded.

 

I hate to drag this all the way back to the tire rubbing thing but I thought I would add this. If your truck is articulating it doesn't matter how much 'suspension' lift you have on it. The tires will still rub. As much as I dislike body lifts they are about the only way to keep your tires from rubbing when your suspension is maxed out.