Colin, I went through all this angst 11 years ago. Now I wonder what the hell I worried about! We're not wealthy by any means, but it is surprising how the money fills the hole it needs to, just like the daily tasks fill the day.
I can't offer any economy tips, because i don't have any, and although my personal income dropped by over 60% on retirement, I have not made any concious cuts. Obviously, I must have done, but I've not noticed them.
As for your caravan, forget about selling it, as you have found out that it is a mercenary world out there, and its not worth anything like what you thought, so keep it.As you're possibly aware, my car is twenty years old, the caravan is thirty-five this year, but they are both well looked after, and carry us all over Europe every year, so age of your kit is not a problem.
I'm perhaps fortunate in that I have never been materialistic: I believe in function over form. In other words, if it works, and does the job you want it to do, then it doesn't matter how old it is or what it looks like. I caravan often with friends who have new outfits, and a lot more money than I have, but I have never felt in any way inferior to them. I've also never felt "looked down upon" on any site, because of my old outfit.
Yes, the thought of retirement can be frightening, but honest, it's not bad at all! I wish I'd done it when I was young enough to enjoy it a bit more!