Will an 80's-90's used caravan do the job?

We are still very much in the planning and dreaming stage of our future journey but just wanted to get an idea of what experienced travellers have to say on the capabilities of an older style Caravan.

We have a very limited budget and are looking at caravans under $10,000.
Are we dreaming?
We want to take our time and see as much of Aus as we can.
Going off road and accessing those harder to reach places, but we dont plan to go along any roads which wouldn't be advised with only one 4x4 vehicle.
We are looking at a late 80's - early 90's model toyota landcruiser to pull our caravan. With expentidture on the vehicle being under $10,000 also.

We will be travelling with 2 kids.

We are really only interested in taking a caravan, perhaps a pop-top... but not camper trailers, campervans etc. In regards to the pop-top option we only want minimal added not, not a van with majority pop-top (if that makes sense?)

Will an older late 80's/early 90's, hopefully 4 berth caravan under $10,000 take us along unsealed roads, even slightly rougher??... we are willing to park the van and tent it to see other out of carvan range locations!

Thanks!