John,
The figures I wrote were for my 2006 Marlin, not sure what year you have.
Boat only (dry) with no options an no gear: 8221 lbs
Twin Yamaha F250 with ss props (wet): 1300
Full fuel (306 gallons at 6.2lb gallon): 1900
Water tank, including water heater (45g x 8.34): 375
Options (A/C, TV/DVD, H/T rod holders, cabin rod holders, etc): 200
Accesories (Radar, 3 antennas with mounts, screens, gauges, autopilot, wiring for same, 24' outriggers, etc): 200
Total so far: 12,161 lbs.
Now I doubt you will have people on board the boat while trailering, but you might have ice, drinks, food, fishing equipment, tools, spare parts, life raft, safety gear, etc on board. IF I trailered my boat often (never do), I would consider the worst case. Drive say 100 miles area a few miles from the hotspot, load the boat with these items and all the fluids listed above (including 300 lb ice, etc. and launch the boat. On the other hand, if you will only store or tow the boat when everything is removed and the fluids are practically empty then my thinking is overkill.
Lastly, keep in mind that most (if not all?) boat trailers are rated for the gross weight. In other words a typical 10,000 lb trailer will take 10,000 lb on the axles and wheels, minus the weight of the say 1500 lb aluminum trailer. So you end up with a trailer that can carry about 8500 lb when it's rated for 10,0000 lb.