PC you are such a worry wort!!
You are a grown up, what your parents think is irrelevent. Yes, they may have an opinion, they are your mum and dad, they are bound to BUT it is your life. Crikey PC, I am 44 years old in November and I shudder at the munber of years I have wasted being someone that other people wanted me to be, not stepping outside my comfort zone because other people thought it would be a bad thing to do. Thankfully I bring my own children up to follow their own hearts not someone else's. Half the time when someone is telling you not to do something they are thinking of themselves anyway, not of you. So, thats the parents sorted.
As for DD, whether she can remember it or not, she will love it, she will have lots of photo's and will have a fab time with a happy mummy. In 2 and a half years time she will be starting school and you will be stuffed!!
Your job, it's only a job. You will find another job, it may not be the same job but so what as long as it brings some money in? Something will turn up or happen. You might even find a job on your travels and want to settle elsewhere. Who knows what the future holds, thats whats so exciting about it. It's marriage and mortgages that spoil it!
Now for money, will have to think further on that one Of course H could always go with you and he could get casual work as you travel. That would do him good too, tach him a bit of responsibility You would be a SACVM (stay at campervan mum!)