To go further in depth to my previous answer:
(edit: looking at your picture, I'm assuming you have an M1123 from the A2 front bumper and no rear bumper. If this is wrong please correct me as some of the answers change a little)
The HMMWV isn't really designed to pull heavy loads. The military rates the A2 series at 4200 lbs towing. That's a cross country rating, but it's the only one they give for it.
The H1 from the same years is rated for a gross combined weight of 14,500 lbs.
The A2 HMMWV is rated for truck gross weight of 10,300 plus a 4200 lb trailer, so 14,500 lbs.
As far as I know only one company claims their hitch is good for more than 4200 lbs of towing, and that's the Federal Military Parts 10k lb hitch. It's around $700 plus freight.
Then you'll also need to install a trailer brake controller, a 24-12V lighting converter, and all the associated wiring. All that will easily cost you another $500+.
So short answer is, if you're willing to spend $1200-1500 or more in order to slowly tow your boat 1.5 miles there and back, and not be able to take it anywhere else, then it might work out for you.
To go into further depth for hitches, the "pinball" style hitches are good for a couple hundred pounds and that's about it. Plenty of stories of people bending them with trailers that most of us would consider to be light.
Plus if you need to use a drop ball with them, the further the ball is from the hitch, the more leverage on the hitch, and the easier it is to bend it.
Legally, for any load more than 3k lbs or 40% of the tow vehicle weight in most states you are legally required to have trailer brakes. Even as short of a trip as you're talking you're unlikely to get caught if something happens, but if something does happen then you might be considered at fault for not having them whether you caused it or not.
For longer towing distances, the engines in these tend to have heat soak issues. Under heavy loads the rear cylinders can't get rid of the heat fast enough, so eventually you can end up blowing the engine. The GM engines would crack the rear cylinders due to the heat soak, the GEP engines have fewer cracking issues but can still be cooked to death.
I believe that RetiredWarHorses mentioned before that he has had to replace multiple engines in H1s and HMMWVs that were destroyed by people trying to tow too heavy of a load with them.
Unless you have a good reason to get rid of the Armada, I'd say keep it around for tow duty and whatnot as it's going to tow better and be more comfortable. The HMMWV is a fun toy and cool, but eventually the novelty wears off and the lack of aircon and other creature comforts gets old for extended drives.
