Aftermarket wheels on Tow vehicles

I have aftermarket rims on my truck. They need to be rated the same or higher then the factory rims. Mine were rate higher then the original. I do believe there is a website out there that can sell you the original. I have seen in but can't recall the name, hopefully someone will chime in. Otherwise search out the aftermarket rims and make sure their rated load capacity is equal or higher then what you have now. A good tire shop can help you with this.