Get the 18hp Billy goat if your deciding between the 2 smaller models. I'm a solo op and the 18hp is perfect for me. Its fast with 1/4 acre lots and still works great for my 3 acre jobs. Once you get a solid technique and get a feel for what the machine can take it will begin to help your production big time.
You can either mount the machine on the front of you truck which I do, get a swing away hitch for the back of the truck, or mount it on the front of your trailer. Last option is to use your rear hitch but the obviously means you can't pull your trailer at the same time which won't work for a lot of people.
I built a wooden box on wheels so when I need to take the loader off I just wheel the box underneath, pull the pin on the hitch, and pull the loader off onto the box. Takes a little practice but it sure beats always needing a helper to unload it.
2004 Ford F250 Super Duty V8 4x4 w/EZ Dumper
Fisher 8' HD plow
2009 Scag Turf Tiger 61" 29DFI w/collection system
2007 Exmark 48" Turf Tracer HP 17hp
2 Shindaiwa Trimmers
Echo T755-H Backpack plower
6x14' Big Tex Open Trailer
Little Wonder 10hp blower
Echo T-150 Hedge Trimmer