I have an ARB Roof Top Tent on the BT-50.
First few times up / down the ladder might make you think twice, but you quickly get used to it.
Last trip Lisi & I headed out of Sydney aiming to get 4 hours out, pull up in the bush and set it up.
Once we stopped it was 5 minutes to get the tent up & be in it.
Just make sure you park on level ground.
2nd night the ground had a slight slope, I just parked on a MaxTraxx to level it up.
Brought mine 2nd hand, about $950 including the annex that goes around the base.
One tip, is to make sure you have a least 1 window open, it's a lot smaller space than the Blackwolf 300Plus that we also use so it can get a bit of condensation in side it.
I'll thow some photos up when I'm on a laptop.
In short, awesome