trailer bunks position 20SF

[hugo]

i have been told different things about trailer bunk position. that bunks should be under the stringers.... my stingers appear to be placed were the hull steps from one strafe to the next, so do the bunks sit under the first outer strafe under stringer or second strafe under stringer. right now mine is set up so the boat cant slide side to side, is this correct? this picture shows bunk location.
thanks.