I use conventional soaker hoses with my rain barrel, which is elevated no more than 15". The barrel always empties down to the level of the spigot, and the total run of soaker hose is greater than 100 feet.
Thank you for posting that detailed information! I have ventured out of "things I have done and know well" to "using information from other sources." My source said conventional hoses wouldn't work. Mea culpa!