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from my experience, in transporting all lengths of coaches, and owning my own Palazzo diesel, with a less than 18' wheel base, the wheelbase is your 'tighter' turning radius no matter the 'length' of the coach.
Tail swing is a concern for some, but a shorter wheelbase takes care of many issues when turning, backing, and generally making maneuvers, especially in tight campgrounds and state and national parks.
A driver that is confident in their abilities, and has years/miles of experience can easily handle either, but 'driving' them is different. Longer 45' tag axle coaches tend to have their rear wheels much farther back on the chassis, with much less 'overhang' to worry about, leaving the rear wheels as the 'pivot' point when turning.
Longer Class A GAS chassis' have the most 'issues', since their rear wheels are typically much farther forward, and they have much longer tail swings, which is where the problems arise - gas stations, to be exact.
The transport industry sees more issues with Class A Gas longer units for rear damages during the entry/exit of fueling stations.
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