Well, what is it that you're looking for? You can check with Daniel over at Plaskit Resin (plaskit_resin@yahoo.ca) or Gary Wallace at G.W. Trucks (gwtrucks@yahoo.com). Neither of them have a Website (Daniel does have a Photobucket or Fotki site with pics of his stuff), but you can email them & they'll send you a catalog. If you're looking for custom built heavy-haul stuff, shoot Rick Mark of Industrial Model Design an email (rick@industrialmodeldesign.com). And Dave at American Industrial Truck Models (AITM) offers more in his catalog then on his Website (http://www.aitruckmodels.com/).
If you're willing to shop overseas, then there's Howard from Kit Form Services in England (http://www.kitformservices.com/), Nigel from Auslowe in Australia (http://www.auslowe.com.au/), and there's always The Model Maker Shop in Austria (http://www.modelmakershop.com/modelmakershop/).