CA/NV property tax Q

Apparently the County Assessor noticed my glider on the ramp at Minden
at the end of April, the very day I rigged it. I got a form letter from
them asking if it was "based" there, how long it was going to be there,
and how long it had been there. Setting aside how long it's been there,
what answers to the first questions are likely to result in the lowest
tax assessment, and which answers produce the greatest amount of trouble?

For example, if I say it's there all year, that makes it easy for them.
Any way to estimate this cost for a CA resident?

However if I say it's only in Nevada during the soaring season and in
California the rest of the year, are they likely to pro-rate NV taxes
and then demand CA tax receipts for it's location during the rest of the
year? Any way to estimate Santa Clara County costs so as to compare
with Nevada?

Anyone with any first hand experience in this matter? You may respond
privately by email if you like. A Google search of r.a.s archives
turned up sales and use tax threads, but little about this particular
topic.

Thanks,
Ken
CA resident