ORIGINAL: bps
They had a super deal on a battery operated tool set that included drill, light, circular saw, sawzal, and most importantly a nailer. I have most all of these tools in 120 volt with the exception of the nailer.
Don't nail the wood parts of the trailer together. Nails only work for objects that don't shake and rattle their way down the road, like houses.
Use #8 fine thread general purpose screws similar to but bigger and longer than drywall screws. Lots of holding power to keep a bouncing box of wood parts in close formation.