I had heard about a product from rvlock.com that other people have ordered and said it is a good product. This product is only for 5th wheels and TT . So today I ordered this 4.0 and remote, I'm a short person and will love having the option of using the keys or the remote just like I do with my car . The owner said if anyone ordered this 4.0 system he would give people a bonus and save them some money . When you would go to checkout there is a box that says code or coupon at that point you enter FR and he will include second remote and free shipping , what a deal !