That's one reason I like my rumble be. Regular cab short box makes it easier to park and do stuff with then some trucks I've driven, altho sometimes it would be nice to have a quad cab to have more secure cargo space, but in those situations we have an SUV I use instead.

For the fuel injector cleaner when a friend of mine owned a shop they had a fuel inejctor cleaner that fed directly into the fuel rail. No pouring stuff into the tank and hoping that helped.