In reply to jim robertson:
Hey, I had a hardtop tentbox on my Hilux for a couple of years and it was great, I had lots of good adventures in summer and winter and never let me down once, me, my wife and baby did a few trips in it too, can be a little chilly in winter but nothing a good sleeping bag wont sort. was ok size wise as a family but abit crammed once baby got bigger, If its just for you then id say go for it as plenty of room and so easy to move around, the tentbox took less than 5 minutes to set up and put down again.
We now have x2 little ones so have upgraded to a van.
check out the tentbox insta and facebook groups, lots of good info on there.