Buy a camper? If yes, how?

Hello everyone, I'm M28 and would like to buy a camper. I earn 2.9k net and currently save 1k in ETFs and another 200-300 in the account. I would like to buy a camper for around 40k. I get 20k as an interest-free loan within the family. I would have to finance the other 20k myself. I have 51k lying in ETFs. 15k of that is profit. I could now sell 20k or get a Lombardi loan for 20k (28k is possible). How would you finance that?