I mounted my BooneDox Landing Gear to my T-Tracks on my Slayer Propel 13. I bought the regular one that did not come with Hardware for mounting to the tracks. I bought 2 Railblaza StarPort HD TracMount kits to use to mount to the tracks. When using just the screws they where a tad to long. I ended up buy some SS 1/4 x 20, 3/4" long hex head bolts with SS steal washers from fastnel at a cost of under $6. You could also buy the Yak Attack 1/4-20 Track Nut, 6 pack for $10, instead of the Raiblaza mount kit as I did. I am not sure if square nuts for the bolts that come with the landing gear will fit the track or not. I used the short 9" center bar with the landing gear. This puts it in the rear of the tankwell. I am not sure if you need to install the other screw and nut to hold the track down or not but I am planning to do so. I have the truss head screws on order from Fastnel as well.
I had a hard time trying to figure out which bar to use and where to mount. I had tried mounting at the front of the tankwell with both bars. The 9" bar seemed to short. The 17" bar was to long and prevented the legs of the landing gear to insert all the way into the knuckels. I ended up taking the 9" bar and inserted that into the knuckles to where it just passed the second set screw then secured it in place. With both knuckles set I insatalled the bolts washer and track nut on the knuckles but left them real loose. Then it was a matter of sliding it on the track. Start with the bolt on the one side then the other side back and forth until all four on on the tracks. Even out everything on the each side and tighten everything down.
Now I just need to decide how to rig out the rest of the Kayak. I have my paddle and stakeout pole to mount which most likely will get mounted on the sides of the propel. If you have the landing gear installed on your propel lets see some of your rigging photos and what has worked foe you.