Hi Michael,
I have another variation on a theme. I have a 2 metre length of aluminium planking, that is used for lorry floors. It is very light, and very strong (will hold up to 10te or more). I judge how much lift I need, put the aluminium on the ground with blocks of wood underneath to form a slope and back the van up the ramp until it is level. Since it is 2m long, the slope is quite gentle, and the difference in height of the two wheels not too great.
Obviously, one wheel is not as high as the other, but our caravan manufacturer says that this is not a problem. We were recently on a site for 4 days with one wheel not touching the ground, although I always try to avoid this, but again the manufacturer says this is OK. We have just part exchanged our previous caravan, on which I had used this technique and we had done over 40,000 miles in it during its 7 year life, with no ill affects whatsoever.
When the aluminium plank is not in use, it fits perfectly across the width of the boot, as it was cut to fit.
However, I am also interested in the Kwikee.
Ian