I gigged an Ampeg fridge with an SVT2 nonpro head for many years. Sold it as age started to kick in. Then spent several years trying to get a manageable version of the same sound. Ended up with a Mesa 400+ (about half the weight of the SVT2) and a Berg NV610(this cabinet just beats the fridge hands down on all counts, not least portability). Now I have also discovered Markbass and the Markbass 450 into my old Goliath cabinet is first call for practices, surprisingly the MB can actually get a decent vintage sounding tone out of the Goliath.
Note to JimmyM - you really need to try a Berg NV610, I would be most interested to read your impressions of it.