Here are many of the suppliers I used for teardrop building and RV parts
teardroptrailerparts.com has many parts to build teardrop trailers. Doors, windows, hinges, locks, axles, very good price for PD 4045 power centers. Aluminum trim.
etrailer.com a super store of trailer parts. Tires, wheels, trailer jacks, LED trailer lights and much more.
recstuff.com/Trailer-Fenders trailer fenders, big selection of aluminum trailer wheels and tires, and many other parts.
http://www.delcity.net is where I bought most of my electrical supplies.
stores.ebay.com/R-and-P-Carriages-Trailer-Sales good prices for RV parts at their ebay store
southwestwheel.com/trailerpartcom sells Flexiride axles and many other RV parts.
raka.com for fiberglass cloth and epoxy.
sailorsams.com for interior LED lights and 12 volt switches.
jamestowndistributors.com boat paint, varnish and marine parts.
www.harborfreight.com low priced clamps.Their version of a Kreg pocket hole tool.