Unfortunately I don't have constant access to shore power, so system would need to be 12v as I wouldn't want to leave my inverter on all the time. I don't have enough battery power as yet, but that all needs upgrading as well. I have a 3000w victim & 4 x 100 A leisures, which are a bit knackered but still work (just).
The webasto worked well when it did work, but it sooted up, leaked & for me just wasn't reliable enough. In total last year after fixing, it worked for 4 weeks in total of the winter. I would stick with it if I thought it would work but my best mates Webasto for years has gone wrong, plus reading on the forums, it would appear that it isn't really up to the job & dozens of people have issues with them. I want a different system,