I tried the Lego type blocks but found that they broke to easy and were a pain to setup when you don't get it right the first time and had to drive off,re-stack, and make them higher,to labor intensive.
When I bought my RV,a former Rental, it came with
Tri Level Ramps They don't break and if they are good enough to withstand the use in that market they must be good. And the are much cheaper than the ones that you mentioned.
I have used them a lot and have had no problems and they are easy to use and store. I have 6 just incase but never have used them all,4 is the most I have ever needed,most times just 2 if at all,they were for the rear duallys.