I really try not to string along posts...  sorry about the multiple posts.

Just wanted to add to the discussion/confussion.

The dimensions on Dometic European website, which includes some brief power consumption figures are for the rc 4000 are:
525mm H x 537mm W x 499mm D which is roughly 20 5/8 H x 21 1/8 W x 19 5/8 D

http://www.coolhen.co.uk/product/product-detail-rc4000.htm

Also of interest to you might be:
http://www.coolhen.co.uk/Portable.htm
and
http://www.coolhen.co.uk/product/product-detail-rc1600.htm

The RC1600 measures
440mm H x 500mm W x 458mm D which is roughly 17 5/16 H x 19 11/16 W x 18 D

In short the RC1600 might be better replacement "fit" for the RC160E, although I don't think it's available in the US... and having the wheels on the RC 4000 would be a nice bonus.  Not sure what the LP hookup for the RC1600 looks like yet either.

Again, for reference, the Dometic Manual for the RC160E indicates: 17 13/32" H x 16 3/4" W x 19 29/32"