If you have something bigger than a Jeep, the 48" is the way to go. If you have something small like a Jeep, the 60" can be used but really, there are better ways to go. I have a 48" Jackall (Canadian interpretation of the Hi-lift) that has been in use for the last 20 or so years on my Niva, my F150 and my Unimog. The jack can be amazingly dangerous which is why I think the 48" is your safest bet. If it is not tall enough, there is something seriously wrong with your strategy (a ratchet strap can limit suspension travel for almost no effort).
1970 Mercedes Unimog
2004 F150 Heritage Supercab
1974 Holiday 17' Travel Trailer
It's not about the truck and it is not about the distance traveled. Get out there with whatever you have, meet people and see things. Push the envelope of your comfort zone and live.