walk your dogs hardcore while you control braking and steering. this system is made for a sun seeker EZ-Tad frame. any other frame will have to contact dogpoweredscooter.com to get different rubber wedges to adapt to your frame ($20?), yours does not need to be a fat tire trike. the arms on this are fixed length and best suited for medium to large dogs, the company does offer adjustable width arms for smaller dogs. this is everything you need for two dogs though i've only had one. the harnesses (2) allow you to clip each dog in on both sides of their neck. over $500 new, lightly used. DOES NOT INCLUDE MY TRIKE just to be clear:)