let me preface by mentioning I'm bias toward slide ins
why?
more performance bang for the buck is the biggest reason for me.
can be easily moved from one van to another.
I keep my TM running for a LONG time.
It will far out last the van.
Not an easy swap for a direct drive to new van
Fuel usage is lower pr hour with "most" slide-ins
I'm also of the opinion that vans aren't made to run 50mph sitting still.
Many mention the low repair/maitainence cost w/direct drives , but they rarely mention the cost of repairs to the van.
Many of those repairs directly related to driving a TM (imHo)
Like water pumps, brittle wiring harnesses, and engine cavity heat related issues
cons of slide-ins
less room in the van
More heat inside the van when driving to the next job
(especially if the TM is mounted behind the front seats)
Marty mentioned a con some time ago, I have to agree with.
Oil film (generally from the breather) from running a gas motor inside a van.
You won't notice it daily, but after the course of a year or more, you'll notice it.
We pull the unit and pressure wash the inside of the van once a year
As far as being "idiot proof", I guess direct drives would be more idiot proof.
But that would be the least of my consideration factor (personally)
It's not like a slide-in is complicated.
Further, if a knucklehead runs the pump dry with either unit, it still costs me money.
and if I can't trouble shoot and fix it over the phone, it doesn't matter if it's DD or slide-in, the thing has to come back to the shop for repair
..L.T.A.