Prowler 2000 Hybrid Trailer - Where do I plug in the propane?

[digitalblack]

So, we just bought this trailer off Kijiji, private sale.
Brought it out to use it. Got the regulators hooked up to the tanks, but have no idea where the other end goes.

End of the regulator has a female threading. The only place I could find that seems to fit also has female threading, once you remove a bolt.
Do I need some sort of adapter?

Anyone have one of these that could send a pic of where the propane hookup is?

Thanks

[Old-Biscuit]

2 Propane cylinders on tongue of trailer
'Pigtail' hose screws onto cylinder (big GREEN nut).....other end of hose goes to a 'auto changeover regulator'
'Pigtail' hose screws onto OTHER cylinder...end of that hsoe goes to opposite side of 'auto changeover regulator'


Output from regulator connects to trailer MAIN propane hose/line which then has 'T's that fed fridge, stove, water heater and furnace


Something similar to this set up