Floorplan vs engine: is Cummins 300ISB 'enough' (39' coach)?

I agree with the engine being under powered for that size of rig. I also feel the refrigerator is under sized and your wife will regret that down the road.

Keep shopping and you will find one you both will agree on.

I don't know what your budget is but this a lot of coach for the money in my opinion http://motorhomesoftexas.com/coachrv/beaver/2007--contessa--38--C1819

Paul