Triple towing (that's what most people call it for some reason) is legal in Kansas and most surrounding states, and I haven't seen anything that specifically requires a 5th wheel and a bumper pull configuration. However I would think that both trailers in your case would technically count against the GVWR, whereas a RV doesn't count against the weight.
http://www.kansashighwaypatrol.org/faqs/trailers.html
http://www.towingworld.com/articles/TowingLaws.htm
http://www.kansashighwaypatrol.org/faqs/trailers.html
http://www.towingworld.com/articles/TowingLaws.htm
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