you can fit whatever size you like, depends on the van and suitable fixing points. I had a ci and it had a 3.5m on but damned if I can remember the model. ask JohnsCross, they will point you in the right direction.
I had a 620 with a 4 metre.
If i remember rightly the 625 is 6.2 metres long 5 berth
I presume your 655 is 6.5 metres long 5 berth
3.5 to 4 metres is plenty imho
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