Can't think why it wouldn't be possible, as long as you make sure it's fully charged at home before you set off the correct size panel should be able to maintain your equipment as long as you don't run to much of itOr, could I just install a leisure battery under the front seat and charge it with a solar panel and forget about the split charging from the main battery with a CTEK?
I think @travelvolts would be the man to advise for this