Itasca66,
I would not change hitch on your coach. If it came with a 3500 lb hitch than that is what you should use.
A few of the chassis that rv's use are extended frames and youy would see that if you look underneath. If the frame extension is tack welded on I would definitely leave the 3500 hitch on it. You also have to find the GCVW.
I tow a car on a tow dolly and are within the GCVW of my 35P.
In conclusion I would not change the hitch that came with the coach. Also WBGO dropped the Itasca name but still has the Itasca models such as Sightseer or Suncruiser but on the front of the coach is WINNEBAGO.
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2014 Winnebago Adventurer 35P,Ford F-53, V-10
2011 Ford Escape,2000 Roadmaster Tow Dolly
"Have a Great Day, Enjoy RVing."