My fiver is lighter than that but has no issues at all and the truck was better than level with no help. I did add Timbrens because the ride felt a little softer than I liked with the trailer, and I prefer it now - nice and firm and it handles highway bumps very well. I don' think you'll have any issues at all, and frankly I don't think you're close to pushing it with that setup.
I'd take it out for a test tow before you add anything to the suspension because I don't think you'll actually need anything supplemental. Then if you're happy with it, save yourself some money. If you decide you'd like to add air or Timbrens or whatever later, make that decision after you've tried it out first.