My van is similar to a Hiace, but with a tailgate door(which I prefer, to having 2 doors) and all I do is stand on the rear wheel to undo ladder clamp.
Do you just use one ladder clamp. Have only used bungees to-date
Having watched six large ladders bouncing off my bonnet and sliding into a busy road (outside a police station) ((trinity rd bristol)) I am astonished that anybody would use a bungee to hold the things on the roof.
Please take some advice from an old pro.
1: Learn to tie them on properly with rope, and invest in good quality 6mm climbing rope.
or 2: get some good quality ladder clamps.
please don't use bungee for ladders.