i have got both the 125 ltr and the 50ltr mk2 omnitrolleys i have had them for over 2 years and never had a problem with them , i now only use them on big jobs or conservatory roofs , as i use backpacks for all other domestic work , if you want to put the trolleys in your van 2 people can pick the 125 ltr up easilly or if you are on your own like i am sometimes ,i bought some ramps from omnipole and can easily get the trolleys in and out of the van.
when i first bought the 125 ltr i used it out of the back of a astra estate with jerry cans it was easy to fill.
gary