As an O/O, you still need your logs to itemize the daily meal allowance unlike us lowly company drivers. Many times your logs are proof as well as any pay statements you received throughout the year.
Save yourself the hassle, you can do better than Land Star. They are bottom of the barrel, basically a Swift for O/O’s.
How were you getting paid? This would be proof of funds at least. Copies of BOL's, a reference letter from one of the previous carriers or brokers would also work.