I currently have only the wd part of my reese hooked up hoping for dry weather next weekend and I will install the dual cam portion...
If you knew how tall the coupler on your tt is when level... tall off the ground... and you knew what style coupler you could assemble shank, ball and wd head (and be in the ballpark) then only need to add chain hanger mounts on your trailer when you arrive at dealer and snap up chains and be close enoigh for drive home... you want to fine tune wd set up with trailer loaded and ready to camp...