I hate caravans, especially when towed along country roads by inexperienced drivers using unsuitable cars - but I do tow trailers a lot, usually big ones with heavy loads, so have some experience.
A bit of advice. . .
Get the van checked out thoroughly to makes sure that it's safe.
1. Make sure that the towing hitch isn't worn, it isn't good if it comes detached from the car or can't be detached from the car when it needs to be..
2. Check that the brakes work correctly, they often don't.
3. Check that the tyres are safe, they may have plenty of tread on them but if the sidewalls have cracks then they need to be replaced.
4. Check for corrosion.
5. Make sure that you actually know how to tow a trailer. You may or may not have grandfather rights, i.e. a towing licence that you're entitled to simply because you passed your driving test a long time ago, but there are skills involved. It can be hilarious watching some caravan towers trying to reverse, but it isn't funny to see people driving dangerously, including but not limited to driving too fast for the conditions.
6. Ensure that the trailer is level. This is vital if it has twin axles but even if it only has a single axle you still need it to be level in order to get the noseweight right. If your car doesn't have adjustable ride height you may need to get a height adjustable towing hitch, for example
https://www.trailertek.com/trailer-parts/towbar-and-towing-accessories/height-adjustable-couplings
7. Have consideration for other road users - if you jacknife or tip your caravan over the road will be blocked for hours