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First, check for "low hanging fruit". I'd check for obvious wires or hoses from the exhaust manifold all the way back to the tail pipe. It really could be anything from a sensor wire to a hose.
However, you mention that your coach is a brand new 2015 model. A certain "break in period" smell is not uncommon. Many of the components in the engine have never seen temperatures of an operating coach for more than factory testing. There will be outgassing of insulation panels and it's adhesive. All the rubber hoses and silicone wires will produce a smell. All the sealants and gaskets used during the assembly of the engine will also outgass and smell for a while.
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