I think its a brilliant idea. Hardest part your going to run into is when a machine requires parts. Can't keep that many parts in there otherwise for common repairs keep all your basic tools/grinder extra bolts and nuts lock washers spray grease oil etc etc
The right side of the 'work' area is all bins that are about 6" tall, 12" wide, and 16-18" deep. I'll definitely be able to keep a decent amount of parts. I usually only keep filters, gas line, primer bulbs, and other small parts on hand. I'll keep my 'bad' gas container in there along with a 'good' gas container with premix and one with high test straight gas. I'll also have chains for chainsaws, some parts machines, that kind of thing. Recoil springs as well. Pull starter cords.. Carb cleaner, ether, WD-40, small engine medic.. Maybe some lawn mower blades in case I run into any that can't be sharpened with my blade sharpener on my drill..
I've got a decent tool kit I can grab and step out of the van with and it'll stay on my bench for access when I'm working inside it.
Looking at buying a small RV awning to offer some shade if I'm going to set up for a while at a location. It's got one RV roof vent towards the rear but, I'm thinking about another one towards the front with a built in fan.
It has 12 volt lighting in the ceiling and I'm looking at mounting a task like on one of those arms that will allow it to swing out over where I'm working.
One thing I look for at yard sales is golf towels. They're great for shop rags and usually pretty good quality, like bath towels in thickness. Pretty good absorbency.. I'll also have a paper towel rack with those blue shop towels on it for more serious cleaning.
For cleaning my hands, I've found that WD-40 works great.. Then a small hand sterilizer for final hand cleaning.
For comfort, I'm thinking about a small 4 cup coffee pot and probably a 12 volt cooler I can use like a fridge. With all the 12 volt usage, I plan to get a decent battery monitor like RV's have so I don't kill my batteries.
It used to have a sound system in the back hooked up to the radio in front and I plan to do something along those lines but, I use my Kindle Fire with Pandora to listen to commercial free music that I like.. I'll probably pick up a small speaker system I can mount back there for the tunes.
I've heard of one guy local that charges $80 to come out and work on stuff. I don't know if that includes an hour of his time or what. Need to get an idea what to charge for 'lawn calls' for the landscapers and the folks that just can't get their stuff to a shop.
I think if it's something I have to just pick up and haul back to my home shop, it'll be a standard delivery/pickup rate of something like $25 plus mileage for anything over maybe 10 miles or so..