20 Trucks, I am going to take the opposite side of this.
You must be a good plumber, businessman; and stay pretty busy. IMO your time is better spent, more profitably spent, running your business.
With 20 trucks someone should give you a pretty good deal and the cost is a normal business operating expense and therefore tax deductible. Purchasing the equipment would be a fairly small capital (or operating expense) but quite a bit of time to work it.
Now, if you were expanding your business to do vinyl work - that would be a different issue.
Cal