Towjumper, many of the smaller Class A coaches have 19.5 inch wheels. The F53 chassis is less sophisticated than the 450 and 550 and I suspect less expensive to build. You may find some of the smaller Class A coaches less expensive than the Class C. Find a floor plan you like and go from there. 2018 models will be coming out soon and deals on 2017 models will probably get better if that makes a difference to you.
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