^1 on the above.
Or, putting it another way, think of the landing gear as a fulcrum. The pivot point on a lever. Whatever weight that is forward of the LG fulcrum is pulling that side of the lever down, which wants to lift the axle side of the lever.
And yes, it isn't much. Most recreational fivers are fairly light up front by design.
Would be a fun exercise on a slow day at the scale. Position the truck and trailer with the trailer axles on the scale, and the truck AND landing gear off the scale. Check the axle weight, and then raise the landing gear until the pin weight is off the truck. Then check the axles weight again, and you would see it has been reduced.
To exaggerate the idea, continue raising the landing gear and lift some of the truck itself. Actually, don't do that, because it is really bad for your landing gear.
