If possible, dump water, empty holding tank(s). If you pull the propane and batts, you will reduce your hitch weight which may or may not be helpful.
Unrelated, I had a high capacity P360XL and it literally tore itself apart. I overbought the capacity at the time thinking I would upgrade. I think it had a rating of around 12k. I didn't even withstand 7500lbs before the hitch ball mounting point totally ripped apart from the frame of the power dolly.
I bit the bullet and bought a 15k Airtug and it pulls the trailer like it's barely even there. Great traction and FAR less wrestling with movement. When your parkit eventually fails, seriously consider the Airtug....far, far, far fewer problems...but it's not inexpensive, esp if you already flipped for the Parkit first.
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