Just check the reason for the walkway through to the cab from the habitation area. Often this is done to ensure that there are at least two means of exit in an emergency from the habitation area. Sorting out a "walkway" into a cab maybe far more difficult than having two doors at opposite ends of the habitation area. I've seen windows used as the "walkway", but they hardly qualify as an easy means of exit. Enlarging the window hole can affect the structural integrity of the cab with all the associated problems of cracking windscreens on rough trails, doors not closing properley, tilt mechanism not locking down.
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