I drove with my camper almost 3000 miles from where I bought it to home with straps holding it to my flatbed.
I had several straps and used jacks bracket to hold the camper to headache wall.
Once you strap something down with big force clamping the top - it will increase friction at the bottom.
You see all truck loads clamped from the top only and they don't go anywhere.
This might not be case here as I don't believe you can put 5000 lb strap on top of the camper.