Fold ur back seats down in the polo and buy a tarp and some tubs for ur gear and 1 for deer.
Fit a pair of winter ( or in the old days town and country tyres to front wheels)
Probably the best thing u can do.
Amazing where u can drive a 2wd drive car/van if a bit of imagination and momentum at the right places.
But any uphills stop them pretty quick.
Always be wary of driving downhill into a field, as that means u need to drive uphill to get out.
Nothing worse than getting stuck just shy of a gate, then reversing back to take another run.
But got too fast u could be sliding into the gate posts
A lot will depend on where u are, soil type, crops weather.
In my area fields are often too wet over winter for anything but a quad.
But ur polo could be 50 or even 30% the wieght of a heavy pick up.
In my area if a field is dry enough for a pick up not to mark it probably almost dry enough for a car to travel to if flat.
35+ yrs ago 4wds were pretty rare even on farms.
That was also before quads were common
I remember 1 farmer had 2 Audi quatro estates ( which are 4wd), his old 1 was used as a farm bus, to feed the sheep, fence.
Ud see it across fields back door up stuffed full of hay bales feed troughs the lot, even transporting sheep about in it.
Absolutely caked in mud and it was a large wet farm too.
Their will be a lot of fencers or dry stone dyers etc will travel fields in wee vans.
4x4s are just far too dear to buy and run.
Most Fc employees will run wee vans, including the stalkers in some areas.
If u don't need or want a 4x4 for day to day use u can manage fine without.
Or possibly buying a cheaper quad can be a better solution as it will travel fields all year long.
If u have somewhere to store it safely