I have had mixed results with my lego blocks as well. Sometimes they hold well and other times they move around due to rocky camp sites (not paved). I have had some crack or get smash where you cannot use them but they were the orange "lynx levelers" (my yellow campo head up much better and I still use them sometimes).
You might try the 3 in one step levelers. I thought about doing the same but they would take up a long area in my storage compartment were the blocks you and mix and match anyway you want to fit into your compartment. But I think they would work fine.
By the 2nd year of ownership I got so tired of block (I carry 4 set and could barely level my rv at some sites) I purchased the bolt on "Big Foot" hydraulic levelers and installed myself. I love them.
It use to take me anywere where from 15 minutes to 45 mintues to get leveled properly with lego block. Now its 3 to 5 mintues (sometimes I put my camco blocks under the jack pads). And it dont rock around when walking inside the RV.
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2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor
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