If he had a brain then i'd have got him a folding staircase, a few of his mates have them and it works well, but Erik's thick as sh*t and would probably try and jump over it, he also struggles with which car is mine and which door he should use, he's tried to get in the drivers seat quite a few times.Have you never tried having like a plank or something with getting them in the back when they get a bit older?
*Dog