A mobile home was well alight when firefighters arrived at Coneyhurst Road in Billingshurst yesterday.
Crews from Billingshurst and Horsham called in a water carrier to help with water supply issues after a call out just before 5am.
A fire service spokesman said no one was hurt in the fire, which left the mobile home gutted and caused minor damage to a neighbouring caravan.
Jets and foam helped put out the blaze and crews left at around 7.30pm, the spokesman added.
The fire is thought to have started accidentally, he said.