If you are asking about upgrades that will improve the towing capacity of your Lariat, the addition of airbags and installing "bigger and better" brakes won't help increase it.
However, airbags might improve the ride and help to level out the Raptor and the Lariat but that is about it. Its towing capacity remains the same.
Are you concerned about whether the Lariat and the Raptor are a good match and whether the Lariat will safely tow it and is not pushing or over the truck's limits?
A little more information about what you are trying to accomplish might help us in answering your question.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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