My 1st 5th wheel rv trailer was a 26' rear bath '84 model on a '82 2500 chevy long bed. Back then extended pin boxes was rare. Most pin boxes had the pin actually behind the front over hang from a few inches to 18" or so on units like some of the high dollar HH II 5ers. The zero pin box on my unit had the front of the trailer 3" high from level (or 6" difference in front to rear).
I couldn't fully open my tail gate so I bought a 24" extended pin box that leveled the trailer which fixed my nose high problem and now I could open the tail gate. Having pulled the unit before and after the only difference was I now had more in bed wind turbulence.
Having hauled for a living I kept scale axle weight tickets in all my trucks. There was no weight changes on the trucks rear axle.
JMO but the hitch location on your one ton drw truck could be placed anywhere and not unload the truck front axle enough to matter.
Now if the trailer had 3k-4k pin weight then thats enough weight to seriously unload the trucks front axle.
Check out a longer pin box for that small 5er....or the Anderson or the same as PullRite ISR Superlite series hitch.