That's about right. So if you rent 3+ times a month, thats 150 euros ($180) a month. That's easily a car payment on a used truck. Not to mention the amount of time you spend dealing with the rental place, and doing the extra return journey. Considering the hourly rate of the average HN user, that's firmly in range of a truck payment.
Also consider that you get to eventually sell / trade in the truck. Vehicles depreciate, but you get some value out. Rental payments all disappear.
... how expensive is renting a vehicle there ? here in france it's like 40-50€ for a day