On a road trip I carry a suitable hydraulic bottle jack and a small assortment of blocking.
Also a lug wrench, and don't forget a spare tire, or if you have duals you can usually get by removing the flat wheel/tire combo and running a single to get to the shop or home.

I also carry a Hi-Lift jack when the trip may require it, they are quite handy.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-