I think you'd be better served by finding "stated value" insurance. Most insurers have these kinds of policies, you just have to find them.
That is what I have done ! I just went in and asked for XXX dollars of coverage and they charge according to the value that I had set.
Please use caution if you choose this approach!
"Stated value" is just that, nothing more, nothing less.
You go to your insurance company and "state" that your item is worth XX.
They are happy to figure and charge you based on that number.
When the time comes to make a claim, the amount you "stated" has very little,
if any value in the adjusters figuring of the "actual" value of the item.
You, I, and anyone can "state" anything, but the adjuster, and insurance company determine what the actual value is, and pay accordingly.
Far better is to have an "agreed value" policy.
You and your insurance company agree, in writing up front, based on photos, documentation, and valuations exactly what they will pay.
If you can't get this type of policy, at the very least; provide the company at the time you take out the policy and "state" its value, with (copies of) photos, build logs, comparably valued trailers, and any other documentation you can, to prove you were upfront in proving a basis for value.
Rob
Waiting for "someday" will leave you on your deathbed wondering why you didn't just rearrange your priorities and enjoy the time you had, instead of waiting for a "better" time to come along...