Our Extra Large Customized RV Skirt is designed for your RV ranging in length from 28 to 36 feet (per manufacturer's specifications). Customized kits are used for class A/B/C RVs, tiny houses, and some uncommon RVs. This kit comes at a fixed price and includes our engineering service. After placing your order we will collect some measurements from you. Following this, an AirSkirts engineer will design a kit with a configuration of tubes suitable to your rig. You'll receive a diagram showing placement of each tube as well as an instruction sheet on installing your skirts on a motorhome. Your diagram and extra instructions will be in your welcome kit, that includes everything else you need to get started with your new AirSkirts RV skirt, including our owner's manual which guides you through all of the important stuff you'll need to know to set up your kit and care for it. Be sure to read it thoroughly and watch our setup videos as well. Additional accessories, such as tire wedges, tire covers, and stair pillows are not included. We suggest purchasing tire covers if you have a dual axle (tag axle) and add tire wedges if you camp in extreme cold temps. You'll only need a stair pillow if your steps pull down from underneath the chassis of the RV. Concerned you don't have the right kit? Don't worry - after you submit your order, one of our engineers reviews the information you provide about your setup and confirms that the kit will work. If you've ordered the wrong kit, someone will reach out to you. And always feel free to call or email with any questions!