In short: This Launching Wheels are the perfect alternative to a risk of theft trolley.
For me, the wheels were in arrears but too big ... For this a TIP:
It takes wheels with a shaft diameter of just 30mm ... These are 25'er carts wheels when expanding the ball bearings (Simple rausschlagen using the screwdriver from the opposite side).
Back to Standard:
Everything is non-corrosive, stable enough for my dinghy with 5 hp (55 kg) and it saves significantly the boat because the hull is now no longer come into contact with, for example, pebble beach. High enough to keep my normal steward (!) In the tilted position from the ground.
In short, worth the money, a great solution to a real problem to the next, it is precisely these wheels only Slipwagenalternative who do not like to be alone on the beach ...