Fire crews were called to the blaze at 8:03 pm and found one trailer well involved in fire and a second trailer suffering damage from radiant heat.
The first trailer was destroyed and the second suffered enough damage that it will be condemned.
Four adults and one child were living in the destroyed home and two adults live in the damaged home.
No injuries were reported in the blaze.
Investigators have now ruled this fire accidental and caused by improperly discarded smoking materials.