Thinking about having my front tires filled, with the polyurethane product from Arnco. Local shop around here (Moore tire), does this process. I called to get some info, and was quoted $334.76 out the door, for mounting two tires, two tubes, and 75lbs of fill for each front tire (7-14's).
The research I've done so far, has reviews all over. Some love it, some hate it, some are indifferent. I like that they use tubes, so it's easier to reverse, if I chose.
If you've done this, have you noticed any extra wear and tear on the front axle components, and or steering components? That's my biggest concern I'd say. I'm not worried about ride quality, since I rarely road the machine. I'm mainly after the extra stability (added weight, and way less tire squish) when using the FEL, and protecting from a blow out while using it.