20 years ago, we did lots of miles with the kids in a three-wheel, bicycle-tired stroller. Mostly on dirt frontage roads bordering the forest akin to many hiking trails, but also going into USFS cabins, 4 to 7 miles of trail from the parking lot. They worked well for that and could be tilted back and then forward again over modestly large logs or water breaks. With two adults, larger obstacles could be passed by each adult grabbing each end of the stroller and lifting it up and over. There was some volume inside and some underneath for additional gear, but not as much as the additional human along dictated. A two-kid stroller, but with only one kid in it would help with the volume of gear.
Along those lines, we also had a two-kid bicycle trailer – aluminum frame, nylon sides and clear windshield in front. There was only ever one kid in it at a time (our surviving children are 4.5 years apart), so the added volume was really helpful and we used it mostly for sleeping bags and pads – fluffy, low-density stuff that we didn’t worry about hitting the child in the event of a roll over. (Some of those?) bicycle trailers have conversions kits to strollers. We didn’t do that with ours – we only brought it on bicycle-packing overnights, but there was a conversion kit available for that model.
If it is primarily for trail use – stroller or bicycle trailer – I’d suggest larger diameter wheels and more ground clearance will let you pass more obstacles more easily.