If you're headed for Tahiti...
Lavac can be a good choice for adults who know how to use it. But if you're a weekend warrior who has children and/or landlubber guests, the Lavac can be very intimidating to 'em, especially to young kids.It's not QUITE as maintenance-free as it's cracked up to be, either. Because the pump isn't attached to the bowl, and can double as a an emergency manual bilge pump (and possibly because it's made by different mfr--Henderson), people don't think of it as part of the toilet. So they happily replace the diaphragm and rebuild it periodically...all the while claiming the toilet never needs any maintenance. Well...neither does any OTHER toilet BOWL.

So, if nobody else is ever gonna use it but the owners, go for it. Otherwise, go with a Raritan. Which one depends upon what size and what kind of power resources you have...I don't recognize "KP 46."