I am not a fan of raising the TT with blocks. Doing this makes it less stable in wind and can raise the steps to an unacceptable height.
I haven't used blocks for the last 15 years.
I dig holes for the high side wheels. All that is required is a shovel, which is a handy thing to have in camp for other things anyway.
The advantages of this method is that the TT CANNOT roll period. So long as gravity is present, the TTs wheels will remain stuck to the bottom of the holes. This makes for a much more stable TT in the wind, and you don't need wheel chocks. And the steps stay nice and low.
Of course there are places where digging holes may be frowned upon.... But those are usually places that are charging for sites, and SHOULD be providing reasonably level sites for those charges. If one is willing to pay for an unlevel site... I have no good solution. You would need to use the blocks of some sort. I see a lot of destroyed plastic blocks in my travels, so I won't suggest them. wood is plentiful, and often just laying around to be had for the taking.
I saw a friend at a trial who had his TT roll off of the blocks and damage his tounge jack. It was soft ground that simply gave way. The tounge ended up on the ground and some of the stabilizers were bent up. It was quite a project to fix... When I went over there to see what had happened, he asked me how I would have done it. I showed him my shovel/hole method... He is an engineer, and had never even considered lowering the highside vs raising the low side!
