since the Dev Build Update today (15.06.2016) the ramps of the VTOL transport variants were disabled.
Tweaked: Opening of ramps has been disabled for vehicle transport variants of the VTOLs
But I think this is really senseless. How can I load a vehicle into VTOL, without open the ramp?
Or how can I drop/unload a vehicle without open the ramp?
My suggestion is, that to load or unload a vehicle to/from VTOL the ramp must opened, because it looked stupid to load/unload the vehicle through the ramp!
An other possibility would be that you enable collision with VTOL and you must drive in the vehicle. When the vehicle is drived in you can fix/anchor the vehicle in VTOL.
But to disable the ramp of the VTOL transport is really bad, i think.
I hope you will think about your change and change it in a better way. :-)