I really don't agree with ramps for a land rover, they are very often too flimsy and offer no tangible benefit over a lifted axle, IMHO.
I have just scrapped three sets of ramps as they have all got ruined in various ways, mostly bent on the upramp, despite being rated to 2 tons.
The 'trick' with carpet or cardboard or wood is something you can do, but really is a trick you shouldn't need.
All IMHO, we can all disagree of course