My last trailer had a large tongue weight and is a definate concern, this time I am building the box over a slightely shorter frame,, I glued two guides onto the bottom of the floor to center the box on the frame after I get it close to finished,, I can slide the entire box back or forwards to compensate for any weight destributation problems,, then when the tongue weight is close to being just right Ill drill the mounting bolt holes and secure the box and frame together,,, the location so far;40/60 ratio is just about right, but I might need to add a little to the tongue sans a tongue box or battery box up front,, just my way of skinning the cat,,
chiper