Each  standard INFINITY TS-9 dock, comes with 2 legs at lake end "0nly", as shown in above photo from shore to lake were it joins the T section (you see the first 2 posts).  Extra legs and leg pockets sold separately, as well, optional wheels are available. Other end goes on shore, or order extra legs and leg pockets, they come in 8’ long or 16’ long & 4’ wide.  You can join each end of sections with no extra hardware; you can also put 2 sections side by side to make a 8’ wide dock or as wide as you like in 4' increments. Doing this you would need 2 L braces per 16’ section..  The images below show you some options.