I have this one
http://www.amazon.com/Pletscher-Two-.../dp/B001GSKVSG on my LHT and find that while loading I have to be careful about how I load each side or it falls over. This one looks more stable, similar to the Rolling jackass which I have on the Dummy and love.
http://www.amazon.com/gp/product/B00...FKRFWGE9HF65AF