Think twice on the Anderson's... They work but there are others. https://www.amazon.com/Blaylock-American-Metal-EZ-100-Wheel/dp/B000R5PMWE/ref=cm_wl_huc_item
I've seen them used them and really like them and then broke one... The Anderson worked fine on the Casita but they were still breakable plastic. The Anderson's give you 4" of lift and... Is that really enough? Look at the entire market and then decide. I'm just not sold on them for the Oliver and my 2 x 12 x 18" home made are a lot sturdier, plus they don't slide out or let the trailer roll. You need a good dead blow hammer to set the wedges under the Anderson's. I also have plywood blocks that stack. I guess after using the Anderson's for a couple years, I'm just not sure that they are what we really need for the Oliver. I'm on a tablet in Oklahoma so you will need to copy the links... Sorry... It just won't let me open the link option without closing the window....
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