Must be a standard problem Fitzy cos I have a 1998 Prado and have that problem. Not sure of a fix though as the door opens sideways and not down. It is a small problem I just seem to work around. Since I changed over to Solar power 14 months ago my gene hasn't seen the light of day, maybe just lucky.
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Live Life On Your Terms
DOUGChief One Feather (Losing feathers with age)
TUG.......2014 Holden LT Colorado Twin Cab Ute with Canopy
DEN....... 2014 "Chief" Arrow CV (with some changes)
Had a Pajero that cause similar angst. Bought a Landcruiser and not had the problem since. Unfortunately you need a split tail gate, horizontal or vertical.
Larry
I have a 150 series Prado SX (3 door) and on the caravan I have the Hitchmaster DO35 offroad coupling and don't have any problems with the rear door of the Prado hitting the coupling.
Regards
Bassett52
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2011 Toyota Prado 150 SX T/D Auto (3 door) 2013 Nova Terra Sportz Pop-Top