Hi
when i supply to customer i always use hi tac tape, the perfecttear was the best i could find. I have not yet had any issues with high tac tape damaging the customers surfaces (pealing off paint from walls or anything).
Any less tac and the customers could often not get the vinyl to lift from the backing paper.
For postal tubes, when i first started out i used to order them in, but now i use vinyl core tubes or boxes as i found the extra it cost in postage to send them was less than the cost of buying tubes in.
But if you are buying them in you want a minimum of 5cm diameter. You will be able to roll something of 1 meter by around 60cm to go into a 5cm diameter tube without it getting damaged. I have done thousands this way.
But if your vinyl is any bigger than that, you need a bigger tube.
The most important thing when supplying to a customer is to give clear instructions, because if they mess it up, they will probably tell you it was damaged in the post or something, so you will get false information and think something was wrong with your product. When really it was fine.
So i always give videos and written instructions to customers.
Hope this helps
Liam