I agree. Do the install and the training. Charge by the hour. When something goes wrong with the equipment, you charge them again. It's not your warranty.

Try to push the warranty issue. If we sell a system and it goes down (under warranty), we bring a backup and replace it the same day, the customer pays nothing. What happens with the internet company?

If you do install someone elses equipment, make sure you get paid for your advice also. A salesperson gives free advice, a consultant does not.

Larry