How to choose a new trailer?

[jonny rotten]

I need a new trailer for my 19 FT cuddy.
Does it matter how deep the "dip" is in the trailer. Meaning the cross members..Some have a deeper V than others...Does it matter or does sliding the bunk/roller brackets up or down make the difference and almost any boat trailer that's the correct length work??

 

[wrench 3]

Other than custom designed trailers such as for a bass boat, They have sufficient adjustment on the bunks and rollers to fit most boats. Usually a trailer with a drop center in the cross members will carry the boat closer to the ground and be easier to unload in shallower water.