I just aquired a Velke x2 to replace the single wheel Velke I had on that particular machine. The only other 2 wheel sulkys I have used have been the Jungle wheels. I really like the larger area for your feet on the Velke x2 and the fact that when backing up the Velke does not kink like the Jungle Wheels. I have a question though, overall what is a better unit that will need less repair and last longer. I have had good luck with Jungle Wheels in these areas but I am thinking of switching to the Velke's if they seem to hold up as well. The only real drawback I see with the Velke is the smaller diameter wheels and smaller wheel bearings or is this a moot point? Or, is there a more preferred unit out there other than these two mentioned. FWIW - The Jungle Wheels are pretty much all that is used and sold in my area so this would explain my lack of exposure to other alternatives. Your comments and advice are much appreciated?