Its only 125' long and tomorrow I will make up one that is 180' long.
This one is for the stage sound and lighting for this weekends event downtown. The cable and plug end is overkill but I wanted the option to use it in other applications if need be, then I just have to change out the box and pigtails for a 250v receptacle.
Its #6-4 and the 50 amp plug end cost a mere $65...The cable cost $2.50 a foot
This one cost about $400 in materials to make up. The one I'll be making tomorrow will be well over $550 It will be for the bounce house blowers.
Just thought I would share