- The Happijac Bed Lift Controller Box is a vital component for RV enthusiasts, ensuring the efficient operation of Happijac Bed Lift systems. This brand-new control module is the heart of the bed lifting mechanism, providing smooth and reliable functionality. It's an indispensable tool for those looking to enhance the comfort and convenience of their RVs. With its straightforward installation and operation, this controller box is essential for maintaining the integrity of your RV's bed lift system, contributing to a hassle-free and enjoyable travel experience. It's a small but critical investment for long-term RV maintenance and comfort.