Welcome Michael.
Your unit has 40 gal grey and black capacity along with 50 gal fresh. Besides free parking on relatives property you wife may be able to go it alone for a few weeks before tank attention while you're out. This would allow her to spend days at the seashore wherever free parking is available. Find a few places that have free or low cost dump stations and that can be extended. Anyway with the king bed and ample floor space you guys and your furry kids will enjoy.