Hi Larry,
I believe those couplers have a locking lever that fold down to latch the trailer to the ball. They should have a hole in there to put a pin style lock through.
As for a tripod, I don't think you could use a standard style tripod like people with traditional fifth wheels can. I think it will be too tall. You will have to probably build something yourself. You may consider some scissor jacks on the four corners of the unit, since the 18' models only have a single front jack post.
Jon
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2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9473.8 (as of 6/18/21)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR
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