Keep it plugged in (At least if it's a 21st century machine)
If you have Battery DISCONNECTS then use them, this will increase battery "Storage" life but alas there are still loads that will run 'em down over time... For a Motor home 2 weeks is a LONG TIME without charging.
Motor homes come in two types for this post.. and two more types which I'll just pay finger service to
Some older ones have cheap converters that given time do more damage than good but if yours was made in the 21st century not likely one o f'em.. Post make and model of converter (The device that turns 120vac into 12vdc)
Now the two types (primary) Mine has a bi=directional isolator, that means if I'm plugged in ALL the batteries are being charged by my Progressive Dynamics Intella-power 9180 With Wizard (No better converter than the INtella Power line with wizard)
And if I'm rolling, rolling, rolling down the highway.. (Driving the RV) ALL batteries are again charged, this time by the engine.
Others have a one-way Isolator.. Rolling (As above) All batteries charged but Parked ONLY The house. THis is true even of 2018 models yet to be delivered..
Hot to find out.
Measure voltage both house and engine batteries and write it down
Plug in
Come back in 2 hours and measure again
on 2nd measurement if you see 13 or more on both batteries you have a good one
If not google "Trick-L-Charge"