what do i have to do to a ford explorer?

i have a 2004 ford explorer that i'm going to take on a cross country road trip from new jersey to washington state. what do i have to do to make sure it will make it and what suspension setup that i can buy is the best for a smooth ride (like shocks and struts) when i add a lift kit about 2 to 3 inches in height, what do i have to do to maintain a smooth highway ride?
 
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