We're about to take the plunge and buy our first motorhome.  While
researching the various models available I have become increasingly
confused because I find virtually identical models with different names.
 For instance, I can find a class C Winnebago with the 24V floor plan
and the very same thing in an Itasca.  Is this simply like General
Motors selling a Chevrolet and a Pontiac that are the same basic car
with minor cosmetic changes, or is there more to it?  Can somebody point
me to a chart or site that lists who makes which models and the
differences between seemingly identical models?

TIA,
mdh

P.S. - Recommendations for _honest_ RV dealers near the Arlington, Texas
area would be appreciated as well as advice on which ones to avoid.