Need Help.... Trailer fuse blowing when towing at night

[MVR 155]

Ive got an 06 H2, had it for about 3 weeks now. We took a trip down to the Ozarks with the jet skis for the holiday weekend and left very early am. About a block from my house I lost the running lights on the trailer (brakes/signals still worked), pullled the fuse and noticed it was blown. Got back late Monday so yesterday I spent all day messing with the trailer, pulled all of the lights off and checked the wires to make sure none were rubbed bare and shorting, put a new fuse in and all seemed fine in the driveway, I jumped up and down on the trailer and kicked it to see if it went out, jiggled the wires on the tongue etc.... (anything to re-create the issue). Drove down the block...fuse out again. Drove across town to my fathers house, took the trailer for a ride with his truck and no issues, then I hooked up his 8x13 Haulmark enclosed trailer and drove around with that... no problems, then I hooked up my friends Jet ski trailer.... no problems. The only issue is when I tow "my" trailer with "my" truck the fuse blows. Im at wits end with this, spent all damn day monkeying around with this and Im stumped.

One last thing..... I even swapped the 7 to 4 pin adapter as well with a different one.

ANY SUGGESTIONS PLEAAAAAAAAAAAAAAASE