You have about 18 months of spending in cash, which is unnecessarily high. It depends on when you want to buy a house and if you are willing to take on risk. If you want a house in the next few years and don't want risk of a market downturn in that time, paying down the mortgage is a better return on your cash than sitting in a checking account, and you just get the money back out when you sell the house. If you are willing to accept some risk investing in the stock market historically has better returns. Either way, don't sit on the cash.
Also, I googled 2008 sprinter vans because your $50,000 seemed high, there are plenty for sale for way less than that unless they are very low mileage and great condition. Are you way over-valuing your van, or are you sitting on a low mileage perfect condition $50,000 van that you use on occasion to camp? I would STRONGLY suggest selling that Van and investing the $50,000 in the stock market, holding on to a depreciating asset that is such a high percentage of your net worth is really REALLY going to hold you back financially (10 years from now that van will be worth closer to $10,000, but the $50,000 invested could be worth $100,000). If you want something to camp in you can get a WAYYYYYYYYYYYY cheaper pop-up trailer to tow behind your Nissan. Even if you wanted a second car to stay a 2-car home for when it would be nice you could get a pop-up trailer AND a used car for 1/5 of the price of that van.
And if you really want a $50,000 vehicle, Tesla's are way more fun than cargo vans - and they have massive advantages for camping since you can safely leave the A/C on overnight :)