Mirrors - Didn't use extenders with the Sport, but did get them ($50 for the pair, I think, at Camping World) for the Standard.
Tongue Wt. - Have not weighed the tongue, but I do use a weight-distributing hitch. I tow level, so I have not given tongue wt. another thought. BUT, with the KD, my 40-gal water tank is in the back, which lightens my tongue. The KB may have the tank under one of the dinette seats. That makes a big difference, much more than a propane bottle or battery. You'll have to check with the factory to see where they are putting the water tank now.
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