Any vehicle is going to only be usable for a limited period of time. Even scavenging, spare parts will run low, some repairs will be beyond your ability, and some parts will deteriorate with age, whether they’re in use or not.
Alcohol will be bad for many of the parts on old simple engines. Newer flex fuel engines will be able to tolerate alcohol better, and generally are going to be more reliable, but they also contain computers and other parts that are impossible to recreate in a blacksmith shop.
For the interim time, while technological artifacts are still readily available, but new low-tech solutions are not adequate replacements, I think something like the electric F-150 would be ideal.
You could tow an RV with a bunch of solar panels. It might not be able to charge quickly, but it would mean you could move occasionally to follow the migrating buffalo, or whatever.
The nice thing about the F-150 is that you can also use it’s battery to power all of the other electrical things which will be convenient to have around. Some days you might have a net drain on the battery, but then a sunny day where you don’t drive or use the arc welder will catch you back up.
Because, as far as energy is concerned, you’re self contained, you won’t have to brave the zombies near the population centers to collect fuel. Of course it might be nice to have a portable generator on hand to supplement your power when you do run across fuel stores.
Some camper trailers already have solar and inverters built in, but you’re scrounging, not shopping, so lets do some basic math. Lets start with an 8x20 foot camper, and some Harbor Freight solar panels at 3x2.2 feet and 100 watts. After building some frames and stuff, you have 16 solar panels on the roof for 1600 watts total. That’s definitely level 1 charging territory. Maybe after inverter losses, and non-ideal sun your down to the 1000-1200 watt range.
A brief search shows that the F150 lightning extended range battery should be able to go from 15-100% in 19 hours on a 220 32-amp circuit, so about 7000 watts. Divide and multiply and we have about 133 hours to charge fully at 1000 watts. So, figure only charging when the sun is out, and maybe it will take 2-4 weeks to fully charge off the little solar array.
If you’re going to be camping in one spot that long, maybe it’s worth having some portable arrays that you can pack away when you moving. So lets say a week to fully charge on 3000 watts, assuming you use a bit of what you put in to run the stove and heater/AC.
You could move a few hundred miles, find a good spot, stay for a week or two while you recharge, and then move on. A pretty slow way get anywhere fast, but all of that stuff should still be working 10 years after the apocalypse when all of the easy fuel is gone.
I think a big determiner of how quickly you can charge is whether you’re scrounging post apocalypse, or if you have a few hundred thousand dollars to get ready pre-apocalypse.