Cannot help with the caravan, but can give you the info from Birkenhead's Civilian Roll of Honour.
Harold Parker age 47 of 43 Lansdowne Road, son of the late Herbert and Adelaine Parker Killed 13 March 1941 at 43 Landsdowne Road. Burial at Landican Cemetery.
Another which might be of interest:
Lillie Parker age 42 of Linwood Road killed 12 March 1941 at 21 Hilton Road. Burial at Flaybrick
The 12/13th of March 1941 was to be Birkenhead's worst air raid with 288 killed and 275 seriously injured.