The Leave camp seems to have at least two factions on this: the first says that we're fine out of Europe and we can trade with the US and other countries, so Europe can go screw itself, but the second says that no one can afford us not to trade with Europe, so nothing will change, even if we leave. They can't both be right at the same time.
It's a little crazier when the same people seem to have contradictory opinions on the same thing.
I know it's crazy isn't it. Different people having differing opinions about what might happen in a fairly unpredictable situation. Who'd have thought it.
That is a misunderstanding of the position.
There is no evidence that the Leave camp is obviously divided into factions on this.
An independent UK would have a range of options to deal with contingencies
(likely to arise from a range of possible EU attitudes; varying from pragmatic, to exploitive, to feeling jilted etc.) from:
For simplicity; I will list only three.
(a) Continuing trade with EU member states without quotas and tariffs
(b) Quotas and tariffs, and therefore reduced, trade with EU member states.
(c) Not trading with the EU and trading more with the rest of the world instead.
Most of us would prefer (a) to (b), but if the EU don't agree; we'd manage with (b)
and if the EU went into an embargo sulk, we could manage with (c) no EU trade.
I suspect that the outcome would likely be a mix of (a), (b) and (c); with
particular outcomes applying to different categories of goods and services.
After all what does the EU produce that the UK can not obtain from somewhere else?