Read the above posts, surely if you have to make that many mods you would be better off making your own.
I made mine because there is nothing out there that meets my needs.
1] it's easier to change containers than fill them.
2] The attached hose reel makes it as good as a van mount.
3] It can carry 2 poles.
4] all electrics are in their own rain proof box
5]all aluminium or stainless so can't rust.
6] carries 20, 25, or 50 liters'
7] I can stand on it to reach over and unlock gates.
The only bad thing is the standard inflatable sack truck wheels, the tyres are crap, and the build quality of the wheels is absolute rubbish.
I would even change the axle in order to get some decent wheels.Anyone got any ideas?