You might be able to find one on the lot with the options you want.
That said, a furnace is nice and we've had one on our 21' towable that we had for 5 years but we never used it. If you're hooked up to shore power, you're already paying for electricity, so get yourself a small space heater.
We have a space heater with temperature control which has a fan only setting. Also go one that's cool to the touch because one of us is a bit clumsy and tends to bump up against things.
Of course, if you plan to boondock, you'll need a furnace.
As to the bike rack.... you might want to ask your dealer what they typically sell. A lot depends on how valuable that bike is and how much you need to protect it.
Glad you decided on the one with a bathroom.