We have the 390 which is of course 3.9 metres wide. So you just need to check that there is a position possible with the two rear legs 3.9 m apart that
a) does not obstruct the windows or doors
b) does not extend into the area at the front where the awning rail starts to drop.
Does that make sense, probably not. Its hard to explain without the van in front of you.
The 390 just about fits from a few inchs aft of the lounge window, right to the rear of our 7.29 m Swift Charisma 550. Forward of the lounge window the awning rail is too sloped to use. So you do need quite a long van for the 390. Maybe the blunter nosed Baileys can fit it in front of the window but I think it unlikely.