There is nothing that will change the sticker on your door. You however can enhance your truck no matter what the nannies say. Start with tires, Do you have P rated or LT's? Get yourself some C rated LT's. May be some air bags.
A lot depend on your locale the distance and road conditions. What vagueness might be tolerable for 120 miles may be horrible for 1200.
Tongue weight is always going to be moving target anyway, unless you load exactly the same way with the same amount of consumables for each and every trip.
I say go for it as long as you are mindful of your shortcomings. You might not be happy with the ride but you won't be a danger.
There is nothing hard dangerous or mysterious about this hobby, but some do like to pontificate!