Capital Rectangular In-Ground Trampoline Kit 11ft x 8ft – Gray $2,145.00 – $2,740.00 The 11′ x 8′ In-Ground Trampoline is a popular large size rectangle trampoline. This high quality in-ground trampoline kit comes with everything needed for easy DIY installation in your own back yard. The rectangular shape is great for fitting neatly into a corner with little wasted space. In stock and shipping daily Select options