Hi all, new dilemma but I think it's a no brainer. I have a 21' cobia on a trailer that I believe is made for a 19'-20' boat. I am going to move the axle (new) about 10" forward after I determine the weight distribution (I believe it is about 200Lbs tongue weight). My question is how long should the receiver be from the tip of the bow. Right now I can hardly open the rear hatch door because it hits the bow. I think probably should be about 6'? How do I determine the distance I need, and, how crucial is that length?. Right now the pad on boat is hanging over about 12"-14" and I have to bring it forward even more so I know I have to bolt another tongue on. Is this safe from an engineering point of view? I know guys that have added extra tongue length so the back of their vehicle didn't have go too far into the water. Also being the trailer was further in the water the boat floated on easier. Thanks in advance for the reply. Bill on long Island.