Pick up to Trailer space

This is a common problem, especially as many pickups have gone to deeper beds and many trailer builders use the jack mount incorporated into the hitch which is way too close. I have moved the jack back on two of my trailers and one of my trailers came with a 5th wheel type jack mounted at the back of the tongue. Hitch extensions are popular with slide in campers, I used to use a 4 1/2ft hitch extension with mine. I did use a load distributing hitch and limited my trailer to about 1/3 of what the hitch was rated for without the extension. You could look up some commercial solutions for slide in campers with overhangs to get something already made and properly engineered, though I made my own and used it for years without issues. I am a mechanical engineer though and had some idea of what I was doing. Remember that you want to limit the torque on the hitch to about what it was rated for at full load with a typical mount in use. The longer you go the less force you can put on it. I limited my force by using the loaded distributing hitch to pick up the tongue and stabilizers to control side to side motion.