We traveled across America two times and up to and back from Alaska.
Basic tool kit was all that I found necessary, plus torque ratchet to check pin box bolts that I found loose and wheel lug torque on truck and 5er wheels.
I faithfully change my engine oil every 5000 miles, so I did carry tools and 5 gallon bucket for that task. I had changed it just before I left for AK, two times on the road, and shortly after I returned home.
Also I rotated tires one time, so carry two 10 ton bottle jacks for that purpose and removing flat tires, which I had none.
Less tools in the storage area is best as others have mentioned.
Lakeside