Ok here the problem. I want to get dual sub for my car but also in a few week im going to convert my car to dual fuel and if i put the gas bottle behind the back seat then where the hell am i ment to put the sub

. Is there any way of doing this so i can have both dual fuel and dual subs. I have thought about putting the gas bottle where the spare tyre is but then where im going to put the tyre and i dont want to be left without a spare tyre cause i do travel 600km - 700km a week and anything could happen.
Please Help