BF...I am going to be honest here..
DON'T.
To go thru all that work to have a 3 inch traveller...don't bother....
Redirect your main shhets aft as suggsted by CL...that is your best option. You can do the same to the traveller
lines...
Forget about the mid height mid thing traveller, not worth it.
that "subway" (a joke with the foot long sandwich they sell), traveller is useless and serves no purpose other than scratch your legs, and allow us a few scuffs here