Normally, I would agree with your comments about warranty packages, however, this is an eight year old trailer. Things will probably start to go wrong soon. The package covers all systems with new replacements with a $50 deductable. At $1500 (Cdn) for 5 years, what are my chances of having to replace a fridge, water heater, A/C unit?
Never mind, I think I just answered my own question! A complete replacement of a unit is unusual. Parts/labour on components will probably be less than a $100 per incident which makes the payback unlikely.
Thanks for the bandwidth.