The Sunnybrooks/Mobile Scouts of that era had a good reputation. With the age of the rigs you're considering, the key variable may well be the maintenance and upkeep that each RV has received. A better unit with an unresolved long term water leak, for instance, would probably not be a better choice than a well-maintained "lesser" unit.
2016 Ram Longhorn 3500 Dually 4x4 CCLB, 385/900 Cummins, Aisin AS69RC, 4.10
2014.5 DRV Mobile Suites 38RSSA #6972
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