You haven’t lived until a fermenting sewer choke has blown back, showering you with liquefied #2 and everything else.
A well-spread plumbing apprenticeship (not just rough-ins and fit offs) will provide skills for finding lateral solutions to many problems.
If one were to take the “fix up a car” route, an older Cherokee or Territory would be my suggestion. Cheap enough to get into, tools are basic, hard to kill, roomy for adventures and good tow pigs.