You don't need a trolley for these DI TANKS, as they are very light, and 1/4CUFT volume each, so they are just as easy to carry, in the event you need to remove them from your vehicle.
EASY-CARRY DI TANK STRAPS make transporting a DI TANK closer to a Water Source so easy.
There is not much more to say ... we are just helping you clean windows FASTER, BETTER, FASTER.
Wish i had these when I first started window cleaning as I was lifing the unit by the lever and broke it. Very convenient if I need to do a small job and put this in behind the the car seat.