Getting Up On Roof

I realize the TM roof should not be walked (or crawled) on by 200# person. Anyone out there with clever solution on how to handle roof cleaning, caulking, AC repairs etc?
I was thinking of a 4 by 4 foot sheet of plywood with foam padding on the underside to distribute the 200#. However, this assumes that the roof will support the 200# when evenly distributed.
I bet someone in this astute group has a good solution.

[Bill]

Bert -

I think your solution is adequate. This topic has been discussed several times, and with a little manipulation of the Advanced Search tool, you should be able to find it. But I think your solution is the same one that has worked in the past.

Bill