Will depend on your spec:
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I've got the 250A monster in the Caravelle as it's electrically heavy with all the driver assistance stuff.
As a general rule keep the "house" load to about a third of the rated capacity - you need a lot for things like heated windows and fans and remember that at lower everyday revs it will not reach peak output. You should be absolutely fine on the 250, likely fine on the 180 (but maybe disconnect if you do short runs in winter) and I would be wary of you have the 140 (but likely fine if you only use it occasionally and connect when you know you will have good charging conditions)
Based on the above I have a startline Kombi with Buisness pack will that still only have the 140A Alternator? At what Rate would you charge the ecflow 2 at ?