maybe registering a used/outta state unit/purchase is different.
with brand new all that was required was the bill of sale and basic dealer provided documents.
it's vague but as i recall ks uses a combination of age, length and weight...
but the weight is GROSS weight, as in gvwr.
not what the trailer might weigh on any given day, but the GROSS CAPACITY/weight rating.
think about it,
u could show up with a scale reading with holding tanks EMPTY vs full and change the fee....
liquids ALONE, is 100s of lbs, approaching 1000 lbs if lp is included.
or GUTTED vs packed with stuff and change the fee.
the gvwr is provided ON the trailer and with the original documents...
now, IF one were to tell the county dmv office person...
"i'm totally remodeling the unit so nothing original applies..."
that statement might lead to a 'certified scale requirement'
but it's a nearly new trailer,
and there's no need to SHARE future remodel plans...
still scale readings are invaluable for many things.
simplest thing is to swing by the scale with truck ONLY and get a reading...
then go back with trailer in tow and do the math.
that will get YOU the info, but i don't see that solving a dmv need.
here are some relevant threads...
there are others (search using any of the key terms in the title only mode)
i have seen folks disconnect ON the scale
but generally THAT is forbidden at trucker/cat scales and will cause a ruckus if tried.
so ASK first, and go in when the place is NOT busy.
here IS a thread where disconnecting is discussed some by those who HAVE done so...
a grain elevator or major truck/service center with scales is another option, mehbe.