Lifetime Drivetrain Warranty
- Does it cover towing?
- Does it cover 1 ton trucks?
- Is the maintenance schedule realistic? 2-4 times per year for Ram 3500! 
- Does it cover common cause, normal wear and tear - such as blown seals or gaskets? This one does not mention it . This one explicitly says it covers seals and gaskets 
I guess we should expect controversy on warrantor weedling out of responsibility such as this -  which was adjudicated to the customer's favor at the end. (a third party mediator in the UK with binding decisionmaking power).
- Conclusion - make sure that there is no catch such as not covering seals and gaskets, and covering real use (towing, commercial). So there it is - looks like that is the catch.