road trip

I'm planning on making a road trip with my family of 7 (me, spouse, 17/16/14/11/9 years old) essentially 4 adults and 3 kids. Planning to drive Toronto to Calgary with family and our stuff then rent a travel trailer there. Trailer is 3500lbs and has a weight distributing hitch and requires a...

My question for all you FJ80 & 3FE enthusiasts is, what would you include in a must have spare parts kit in your rig, thinking extended road trip around USA and down through South America? What are the showstopper components that I should have on hand?