I know that Vanner seems to be the standard, but I came across a guy offering a Newmar 32-12-25 for about $100. Would this do the trick? The link is below. Would I then need a separate 12 volt battery for the generator? I guess one question is whether the 20 amp continual output is adequate for the normal RV stuff.
http://shop.sailnet.com/product_info.php/products_id/6063
This is a converter, not an equalizer. The difference being that an equalizer puts out a voltage that is proportional to the input, or in other words, exactly half the input voltage. The converter puts out a regulated 13.6 volts regardless the input voltage.
These can often be found on ebay and other places for around $10-$20.
I use a converter on my house bank. It is rated at 20 amps max, about 18 continuous. I've blown the fuse once but it was my fault. I currently have a buffer battery in the system, but I think I'm going to remove it this spring and just run directly off the converter.
The late Jock Fuggitt did a nice electrical writup on which my system is based. You can still find it at http://www.purplebear.com/busnuts/bus_elec.html (http://www.purplebear.com/busnuts/bus_elec.html). Suggest you pull a copy to your computer and read it often.
craig