Wheel holder, extension module and rear load carrier

The present invention relates to a wheel holder, which is designed such that it can be pushed on an end section of a profile rail () of a rear load carrier (). Also the invention relates to an extension module () for carrying a load having attachment means for releasable attachment to a rear load carrier () comprising at least one profile rail (), wherein the extension module () comprises one extension profile rail () and two wheel holders () which are preferably pushed on the free ends of the extension profile rail ().