I replaced my Road King this year and they highly suggested after seeing mine sitting on the old trailer to go to the 10Kish trailer over I think was an 8600# before.
WIth the 16" wheel/tires, it made a huge difference and rides much better. No more squatting .I am very happy I went to the 10K model.
I am a bit tongue heavy as they thought it needed to move forward a bit and cut off the extra bunk length, but in reality, I should have told them to keep it's existing position as before, it was perfect in tongue weight.
I think what I am going to do is move it back the 3" that they moved it forward, and move the bunks back/redrill new holes and be back where I want/need it to be.
Thinking I can fill the holes with CPES and Epoxy, or just put some galvanized carriage bolts in the empty holes.
Also, the put custom heavier bunk brackets on....I think they are 3/8" over the normal since mine were slightly bent on the original trailer.
These boats are heavier than the brochures once you have them fully loaded with all the gear/water/ice/fuel/tackle, etc.