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Take if from someone (me) who travels a lot with eggs. I take multiple 3 hour trips a year with my small, and have tried every way possible. Anytime an egg is hooked to trailer hitch in any way, u run a very serious risk of cracking atleast the interior ceramic pieces of your egg. I love to have my small egg on the back of my truck, but I belt it in my back seat for the ride.
I also take my medium on trips, but the grill goes in the truck, and the full table gets put in the truck bed.
As cool as that contraption looks, it ain't gonna work all that well in my opinion. Sorry.
Here is what mine looks like.
and then on the back of the truck...
Also fits in this table....
I am not trying to rain on any parade...just save eggs from breaking.