Trailers are OK if as mentioned you limit yourself to rogh roads or tracks.
Once it starts to get difficult, i.e sand snow mud they become a real liability, also they tend to get hammered a lot worse than the tow vehicle ,
The axle width being the same in some situations is a plus and also the opposite applies.
Try to keep them as light as possible, and as strong as you can. which tend to be in direct conflict.
They are very maintenance itensive as wear rates in the shackle bushes are very high. Shock absorbers are very advantageous but mounting them in a effective manner is a problem. A good long A frame helps with stability, and also makes them easier to reverse, although too long an a frame leads to problems with ramp over angles. A high tow point on the tow vehiclke is preferable to avoid problems with the hitch digging in when having to deal with a sharp climb.
You need a curtain on the front of the trailer to stop the stones that fly back from the tow vehicles wheels hitting the front of the trailer, and stripping the paint off , but more importantly they then rebound and take the back window out of the tow vehicle.
I used two in Oz , built both myself , put a roof top tent on top of the trailer , (wife refused to climb up the ladder on to the top of the landrover, something to do with being pregnant at the time I think
) .
Re education a laptop with suitable educational programs should allow the older , or even the younger one to keep upto speed with the relevant stage of learning for that age, and also it can be structured as a game in some of the progs. The real bonus is the learning by experience, my own daughter greatly improved her geography knowledge, also general knowledge, mapreading etc,