Ive got an hds 10 on the rail, if I had it to do over again I would just go with the HDS 8 instead, due to the weight of the hds 10. Ive run a Hbird 987 on the rail as well with no problems. Im running a 7 on the front, a 10 on the rail, a Hbird 788 in the dash and 2 LSS structure scan units. Mike