If the 18 inch piece of 6x6 on it's side is high enough I would use that. If you can put the car jack under the tongue to lift it up enough to slip the 6x6 in place under the tongue jack that would be OK but the truck sounds a little safer. Make sure your tires are well blocked so the trailer can't roll on you.
Safety first, don't get in a situation where it can fall on you!
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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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