I use the lynx leveler blocks with the double axle. Just use more of them - had to pick up a 2nd set when we upgraded from a single to double axle TT.
Single row high, it takes 6 of the blocks. If we need to go 2 blocks high I think it's 8 on the bottom row, 6 on the top row... can't remember exactly, but anyway they work just fine.
2012 Flagstaff V-lite 30 WTBS
2011 Ford Expedition
4 kids and a hubby & never enough time to camp!
2011: 17 nights 2012: 26 nights 2013: 46 2014: 20 2015: 16