Navcomic

Austin 7 -   
Thank you for the prompt about my typing error but, as one who has been licensed for 43 years, I think I know the usual limits of the Broadcast FM band in the UK at least, thanks. The lesson for me is to review more closely before posting.
Radio Amateurs are not strictly required to know spot frequency allocations or band limits outside their own bands - just an appreciation that there are other users in the spectrum and the precautions needed to prevent interference to them - besides knowing their own amateur band frequency limits and which parts of that band may be 'shared' or have some geographical operating limits for parts of the band within the UK. In the same way, it would be unreasonable to expect you to know our amateur allocations (you may well do so which is great). Over the years, one does get to know other allocations and spot frequencies outside our bands but, I must admit on this occasion, I did not know yours probably because I do not operate on 4m and have no requirement to be involved with low band equipment. It was just a mistake by me from reading your answer too quickly. :sun:
Just to further confirm: you are correct. I do have the 12N socket as I am only towing a basic trailer and so, as a result, do not have the fridge and other feeds. As for the Hydrogen question: again, I agree. However, provided the battery is not overcharged (and the C-tek prevents that happening), the level of hydrogen given off is way way below the dangerous level. If having an AGM was thought to be unsafe inside a vehicle due to the gas question, then the use and sale of AGM batteries for use inside motorhomes, and especially under the driver's seat as has been mentioned by another respondent, would be not allowed for obvious reasons. It is appreciated that ventilation is still required, however. 
I hope that provides some sort of clarification of my earlier answer.