The 1978s (roughly) still have bladders, though it wasn't a clean break from year to year so if you care about wet wings vs bladders, look up the serial number where they switched. 79ish-86 were wet wings.
On the flip side, the 78s had steel gear pivots and the 79-86 had the problematic aluminum ones. Same thing, there was a particular serial number for the cutover on this, and there are some late 78/early 79 models that have fuel bladders and aluminum pivots.
Luckily, there's a company in Oregon that has gotten approval for a repair process for the gear pivots and can fix them. Takes about 6 weeks and $4,000. First symptom you'll need it is a brake going soft as the fluid leaks out the crack.
Other than that the R182 is about as close to a "do it all" airplane as there is. Haul a load, go into short unimproved strips, and still top out around 150 KTAS. It's not going to be the most efficient thing in the world, but it'll pretty much do whatever you ask of it.
It sounds like you have a particular twin in mind - What is that? You may get some level of credit for lots of time in the equivalent single. For example, Bo->Baron, Lance->Seneca, Comanche->Twin Comanche, Diamond Star->TwinStar etc.
No such luck with the Cessna 310 though. They did make a prototype C620 with four engines, but they never made a C155 with one.