i keep wanting to hit a scale and get the rig weighed, but i seem to always be rushed or the scale is closed.
my best guess for the rig weight would be 5800# boat, 1200# motors (F225's), 1500# fuel, 500# misc gear and tackle, tri-axle 15,000# trailer 1500# = total of approx 10,500#s
not a clue on the tongue weight, but i don't have any towing issues such as sway with the current set-up.
you can utilize a HD tandem trailer with 7000 or 7500# axles, but i prefer a tri-axle trailer.
tri-axle means added maintenace and more tires, but i feel that it carries the boat better and gives me a better safely margin should a tire or even a whole axle fail.
I recently had a bearing literally toast on me this season and was very happy to have 5 tires and 2.5 axles to safely carry the boat a short distance to get repaired.
This past month i've added another spare full tire/hub/bearings/spindle assembly (now total 2 full sets) along with a spare hub/bearing set should i just need to replace a bearing.
Possibly pounding out bearing races and repacking the new bearings with grease on the side of the road does not appeal to me so carrying some inexpensive spare parts for faster and easier fixes is my route.
I now check before every trip the grease condition in each wheel (pull the rubber center cap off and look at the color of the grease), if it's cloudly/milky i can in a pinch shoot a little more clean grease into the hub and change the grease later or if i'm at home, i'll try to repack the bearing and consider replacing the back seal.
I don't like bearing buddies as they necessitate the hub be filled with grease which leave little room for any expansion or the needed air to help keep the bearings cooled, they make visually inspecting the grease difficult, the spring mechanism isn't perfectly consistent so it's very easy to over grease a hub and blow the grease out the back seal which can be a really bad thing if you run drum brakes as the grease is now all inside your drum!
One last thing, when the boat is off the trailer, its a perfect time to check the play in the wheel and avoid excessive play to expedite bearing failure.
with the boat off the trailer, simply grab the top of the tire and give it a good shake. A small bit of play is ok, too much and either you need to replace bearings or the nut needs to be tightened up (but not too much as too much can be worse than too loose!).