Each year at the MCG Grand Final a stage is rolled on for a performance. The turf on the MCG is very flat and smooth. There is not much weight on it, just a bit of backline. It's also towed in a straight line.
All week during prep I felt uneasy about how much I didn't know about the gig I was about to do - I was taking an XLD system and subs out to put on a rolling stage on a polo ground. Everyone told me it would be fine. The original spec was for an XLE system. The client got upgraded to XLD because it was available and bigger. BIGGER IS NOT ALWAYS BETTER.
We got to the gig, waited for the stage to be built and at about 4pm on setup day (the day before the event) we got to put the PA and monitors on. This included four XLD per side (and a sub a side as well). The Midhighs on their own totalled 160kg on one side of the stage, and the M7 monitor board weighs about 50kgs. Lets not forget the 2 massively heavy amp racks that run the XLDs. I don't even know what they weigh. Then of course there was the distribution board, the power runs, the monitor speakers (we started with about 8 of them on there as I recall) and a bunch of other stuff.
We were meant to tow the stage out 3 times and back twice during the course of the event for awards and such like, and the third time was so that the band could play. Each wheel could handle 30 kgs. and we were well over that..... Obviously the majority of the wheels got ripped apart on the first undulation of the polo ground. A polo ground is nothing like cricket turf, and has many pits and potholes and gets quite churned up by the horses.
The field is massive as well and keeping it smooth is both unnecessary and prohibitively expensive. Pop!Pop!Pop! on the first curve and we stopped and replaced at least half the tyres. We got spares in from the staging rental company and the event manager negotiated the tows down to one - the last one. (We ended up doing the awards on the ground in a fairly brisk wind so here I include a note to organisers - an event by the sea with large backdrop for photos should have plenty of airholes in it to prevent it becoming a sail to carry away the grumpy looking people dressed in black)
We ALSO PUT the DAMN PA BACK IN THE TRUCK and after several phone calls from between all concerned parties, a very red eyed staff member brought us a new and much smaller rig at 7 the next morning after finishing at 2 at Festival Hall the night before. So for the actual show we towed the stage on with the new gear and half the number of foldback monitors, but we stiill had all the backline and the M7 on there as there was really no way around towing that on. The above picture is with the replacement system. Most of the tyres still buckled and popped and ripped apart, but it didn't really matter because we were there on the spot, and the show went ahead, and the public was none the wiser.
Moral of this story is if you feel you don't have enough information - persist with your questioning. If your questions are not getting answered and are making you unpopular, make sure someone else is accepting with open eyes the responsibility for the gig going smoothly. "If you give me the tools that I need, I can give you the result that you want".