Well, got it tied down. Home depot has some 3/8" lag bolts 3/4" long, just the right size. There was a bracket in a cabnet with some other hardware for the sofa. Used one of the brackets to tie the sofa to the seat belt stud that's welded to the frame. I had a piece of chain to span the gap from the floor to the frame of the sofa, I feel much better now that I know it's secure. I also installed the latch lock that keeps the sofa from opening up in case of a wreck.
After the install I had one of those OS# moments
I pushed the slide close switch and nothing happens., check the rear slide and it works. I really thought I might have drilled into some wiring and screwed every thing up even though I thoroughly checked where I was drilling. After checking every thing again I pulled the rear slide switch looked at the wiring and then looked again at the front slide switch. Lo and behold one of the wires attached to the front switch with a spade lug had come off
I crimped the fitting with my pliers for a snug fit pushed it back on said a prayer and pushed the button. I was so happy to hear the voice telling me to make sure every thing is clear of the slide
Thanks again for those that made comments, I appreciate the help, Mike