Cement
If the bedliner is a rubber base it should be good to go. Some are pretty hard and will fail with expansion and contraction as already mentioned.
Get some of that oil on both sides where it hits so any trapped water will not wick into the wood from the bottom side of the ramp.
Tops and sides. Don’t do the bottom. Buddy years ago did one of my ATV Trailers, it did good. It was free so it was done. All my other wood trailers, I buy the cheapest hydraulic fluid and get to rolling it, let it soak and roll several coats. Will last for years to come. Have a dozer trailer that my grandpa used in the 50/60/70s still in use, same boards.
Will the OP have to get up a good head of steam before driving up the oily ramp? 
Painting to soak in wood. I thought that was what you were supposed to use old motor oil and retired fish frying oil for. Just have to be careful when wet and tracking dust as it collects.
Last Thompsons I bought was some kind of eco friendly water based something different stuff. Never again.
Last Thompsons I bought was some kind of eco friendly water based something different stuff. Never again.
It’s garbage. Don’t use it at all. On anything.
I used to use spent engine oil when I did an oil change. Cut it with diesel and put it in my 2 gal sprayer and spray trailer bed. It was good for many years.
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I seen SKS and mosins bedlinnered
I used 1/2 diesel and 1/2 used motor oil on my utility trailer/car hauler after I replaced several boards. It’s only been 6-8 months though. Several coats (3-4 on the new stuff) and that old wood drank it right in. Trailer looks better than it did when it was new. We’ll see how it holds up over time
