"RC Construction" is not a manufacturer but a toy category. Most major toy outlets sell a full range of remote control earth-moving toys, including shovels, excavators, loaders, bulldozers and dump trucks.
Toys labeled "RC Construction" are remote control construction vehicles made by a variety of companies. As of 2015, sites that sell toys, such as eBay.com, Hobbytron.com, Amazon.com and ToysRUs.com, have many brands to choose from, including Bruder Toys, World Tech Toys and Doyusha. Each manufactures a variety of earth-moving vehicles.
Consumers can make informed choices when purchasing these toys by consulting descriptions and customer reviews. Because many different types of each earth-moving vehicle are available, it may also help to view videos of them in action. These are available on the RC Live Action channel on YouTube.