Have them, based on forum input, use them, based on my own decision, like them based on my co-pilots input and her not having to lug 2 or more 2x12x48 inch boards around anymore at 65 years old +. And yes we have 16" wheels.
Actually, there's a really good hint that comes from the bubble level on the front of your jack!
We've learned from experience with 2x6's on earlier trailer (with more basement storage-no room in the Airstream!) that one ring off on the bubble level is exactly one board--or about 1 3/4 inch off.
We just got ours from e-trailer and are hoping that the one will fit between the 16" wheels on our 2009 International 28'.
This is the level I now use. No more having to get out of the Jeep to see if the trailer is level.
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MICHAEL
Do you know what a learning experience is? A learning experience is one of those things that says "You know that thing that you just did? Don't do that."
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