How much is your ball dropping when you hitch up? if it is several inches you might consider a lightweight WDH like the Andersen to pull it up a bit.
You might also try re-distributing your load in both the trailer and the back of the van. Your rear end and the tongue weight may be to much for your Sienna. It could be pushing down your rear so much that your front wheels are running way to light which can kill you and your family in an emergency.
Study weight distribution hitches and why they are used. The search function above can give you some great info.
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2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
Andersen WDH hitch, Renogy 100 AH Lithium &
200 Watts solar panels from Renogy
Prev. '14 Jeep Grand Cherokee Overland, gas 3.6 V6
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