The next vehicles and trailers stay on the map after completing mission:

• Pedro Bay: Scout 800 in Contest Weather Conditions
• Quarry: Service Trailer in Task Settling In
• Lake Kovd: Portable Cabins in Contract Cabin Fever
• Imandra: Portable Cabin in Task New Pool

Other bugs:

• Trailer Store at Pedro Bay can't be used and it's not showing on the map.
• Can't close repair/refuel menu without releasing the winch first.

@TTFH3500 said in Vehicles/Trailers stay on the map after completing mission:

Imandra: KHAN Lo4F in Task Nighttime Delivery

You suppose to be able to use this KHAN Lo4F, after you finished the task. You can jump into it, drive it and even teleport it to garage and sell it.