Hi,
Cliff I am in the process of building my own trolley via a SHURflow backpack which is the easier way to diy. I am enjoying sourcing the parts that I need to get it fully up & running. It is time consuming sometimes frustrating & rewarding at the same time.
The reason I decided to build my own & not buy one of two quality ready made trolleys which you might be familiar with on this site is because I can sometimes be a tight fisted git!
My advise to you would be to buy one of these quality ready made trolleys as they will only cost you about £400.00 more. I intend to buy my son Scott one when he passes his driving test hopefully very soon.
Hope this helps
Kevin WINDOLENE.