I use tanalised roof battens (from the local timber merchant). I have attached these to the rear load eyes using carriage bolts, one batten each side of the load eye - so they are pretty secure. Once these are in place you can make a small raised timber frame attached to these battens to your own design using L-shaped brackets and screws.
I now use an electric reel but when I had my old Claber reel I bolted this to a piece of raised timber (which was part of this frame) using U-shaped bolts.
I'll try & remember to post some photos tomorrow.