On the Vac, this is something along the lines of what I would get, there is a model below this with a 5hp but I think I would probably get the
chipper option while I was buying.
Agri-Fab Tow-Behind Mow-N-Vac Chipper/Shredder — 8 HP, Model# 502492 | Chipper/Shredders | Northern Tool + Equipment
And yes, it is vacuuming up the debris, your deck get's it too the discharge chute, then the vac sucks it through the impeller into the trailer deal.
I am on a different sheet on the motors then Dargo, although, with fuel prices going the way they are I may have to rethink it some.
IMO, gas, carb and air cooled are "good enough" and I am not willing to pay the premium for the other things. They definetely have their advantages, but for us, in our situation we do lots of small to mid size yards, we get more windshield time and trimming time then mowing time so I would rather keep my initial investment down.
Also with a gas engine, if I get really pissed at it, I can kick the dang thing off and get a brand new one for around $1500 to $2000 with full warranty.
For us as well, carbs, air, gas, are very simple and easy for me to understand and troubleshoot. Get's me going quicker. The more complicated the machine, the more there is to break, and the more likely I will have a hard time troubleshooting it.
Just worked on a Scag with fuel injection on a Kohler, we ended up doing factory tech support and swapping some controllers off a new mower to diagnose and get the guy (commercial cutter) going.
Your pricing kind of scare's me a bit.
I think I can get the Lazer Z that we run (I forget what they call it now, it would be the "old" model) for about $7500 (they call it the "advantage series" I think, here is a link,
Lazer Z AS riding lawn mower for the landscape professional from Exmark. and I am pretty sure I saw a hustler for about the same price.
As to the Brigg's, I would not quite be ready to go there yet. For the 5 or 8 hp on the blower, fine, no problem, but on my mower I would rather have Kawi, Kohler or Honda. I have cussed my Kawi on occasion (they put the freaking PCV valve in the MIDDLE of the dang engine) and had literal fits out of 2 kohlers that both broke rods but all in all they are well proven engines and their are thousands if not millions of them out there. The new, bigger commercial Briggs in my opinion have just not proven themselves yet so I would not go there.
Hanna and I were talking last night about our mowers, and I think one Exmark is about 7 years old, and one is 8 and the dixon is about 10 years old.
Dixon has had 3 motors, but the first one failed in the first year, the second failed first run, and the 3 has been there 9+ years. Exmarks motors are still original, Kawi and Kohler.
If I did have the option I would get the Donelson (sp) air filter setup but I do not have it on any of my mowers.
Good luck whichever way you go, but I would think long and hard about going past $7500.