When I look at a sectional, the closest airport to my destination is almost always a Restricted airport. I would love access to those, so I try to keep access open to mine; but only to qualified pilots/planes. I have been contemplating forming a non-profit association of restricted airport owners for just this reason. We could share information like you are requesting and establish reciprocity agreements. ? I?m much more comfortable letting a fellow grass strip owner land VS a guy wanting his first grass landing in a rented 152. Wouldn?t it be great if 1,000?s of us belonged to a group that has a blanket insurance policy for members and said ?If you meet these qualifications you can land at my facility?
Every state has different liability laws. There are two separate issues. The first is how to protect yourself. The second is how to control use of your airstrip. - I get 4 or 5 unauthorized landings a year (that I know of). It does not matter that your field is Restricted when someone decides that they are exempt; and in New Jersey you are liable for your uninvited guests. For this reason, make sure you carry insurance and enforce whatever usage procedures and restrictions you have. You can't do much about someone landing there without permission unless you want to be a real jerk, but you can get the tail number and send a nicely worded letter explaining your procedures for granting permission and ask the pilot to follow those procedures in the future. This way you can demonstrate enforcement of the Restricted classification, which will be important if you have to defend a suit from an unauthorized pilot.
For granting permission I have a written procedure and a written application that clearly states permission is not granted until signed and returned by me. Anyone landing without it does not have permission. On the application I am asking for things like TO/LD performance of their plane, date of last BFR, medical, Annual inspection, hours in make & model, short field experience, etc. It identifies the dates and weather conditions that the permission is valid for, and includes a waiver statement. It also includes a detailed description of the hazards and procedures. ? There is no opportunity for a go-around at my field, and 60 foot trees are waiting for you at the end, so I want written proof that the person landing knew that before coming and signed a form saying they were properly qualified.
Send me your e-mail and I can send you copies of what I have.