Having bought a motorhome, when we retired, 19 years ago. We subsequently spent the next 15 years touring Europe for 5-6 months of every year. I was brilliant. A combination of Brexit and Mrs B’s health brought it to an end.
My advice is, the money is not the major consideration. You have to be sure you will LIKE it! Many people give up after one trip. Next, you need to think about the type of van. If you are planning short breaks, or, if you wish to visit many places, spending just a day or two in each, then a campervan may suite, if (as we did) you plan to go for months at a time, you need more space, so, a coach built or A class Motorhome may suite. You need to think about what “kit” you plan to take with you, and, how you will store it. Another major consideration is, once you get to your destination, how will you travel around the area? (We used bicycles, and, sometimes towed trailer with motor scooter on it).
We spent about £30k 19 years ago, subsequently upgraded 3 times, the most recent 2017 (that one was £50k then). Not sure what % of our liquid assets we spent, but, it was a fair chunk!
It is a lot of money to spend, but, if you are going to enjoy it, DO IT!, my children told me “go for it dad, if you don’t, we will! “.