The carp porter by prestige can handle rough terrain.
One of my carp syndicates is accessed across a field and this is regularly ploughed!
nice thing about the carp porter is it folds up flat and will fit in a car.
I also used mine to carry 5 days worth of camping gear, food, clothes etc. from the car park to the camping area at the download festival, best part of a mile and a half, it has managed 3 years worth of that as well.
That is challenging terrain and with my Mrs going too, heavily loaded!