If you're carrying your own equipment, (ie a PA system), then a restricted O licence is fine. You can use a rented truck for more than an month - it's just that up to a month you don't have to list your vehicle on your O Licence. We have a restricted O Licence for 2 trucks and a trailer and we don't own our own trucks. Obviously drivers will be subject to licence and tacho regs. You'll have to prove financial standing to show that you have enough cash in the bank to meet the current financial levels on your application and it takes about 8 - 12 weeks for the licence process. And you have to advertise the fact that you're applying for an O licence in the local rag. It's a bit of an effort applying for the licence, but well worth having...