Aussies missing during Mexico surfing trip

The families of two West Australian men who went missing in Mexico during a surfing trip are fearing the worst after their van was found.

Dean Lucas and Adam Coleman, from Golden Bay, have not been in contact with family or friends in more than a week.

A Mexican article online reported that authorities had found a burnt van.

The Department of Foreign Affairs is providing consular assistance to the families and issued a statement on their behalf on Sunday, saying they were aware the van had been found and a "tragic event" had occurred.

"The families hold deep fears for the safety of their sons, but stress that they are still waiting for details to be confirmed," they said.

Family members will travel to Mexico this week.

Ms Lucas' girlfriend Josie Cox posted on Facebook that the men had "solid plans and reservations" to be at Guadalajara by November 21, but never arrived.

Their last confirmed sighting was when they got off a ferry at Topolobampo, on the Gulf of California, on November 20 at 10pm.

"They are very keen and confident surfers from Australia and may have gone in search of waves in remote villages close by," Ms Cox wrote on Friday.

Ms Cox posted on Sunday that she had learned Mr Lucas was going to propose to her.

A social media campaign has been launched to try to find the men, with concerned friends using #FindDeanandAdam to share images of the pair.

The men were driving a blue and white campervan with Canadian registration plates.