It never occured to me to use a longer air hose..That makes a lot of sense.
In the beginning when I started working on my bus, I bought a lot of tools I don't need/barely use with the mentality of "I'll need this soon when I do x or y" Some of these (cheap) tools broke a day or two after use. if you plan to buy cheap tools, I reccomend buying them very close to when you plan to use them so you can return/replace them. I like buying from walmart, home depot, and harbor freight for their 90 day return policies. I guess what I'm getting at is, buy the stuff you need not too far ahead of when you'll need them.
Amazon Prime + amazon store card(not amazon credit card advertised on site) have been invaluable. 2 day delivery on most items and 5% back on all purchases are great.
I recently got some cheap toolchests off craigys, and oh man I wish I got these sooner, they are super helpful with organizing your tools.
I've been using two enclosed trailers to store my stuff. One I got for $250 (great price), the other was $560 (acceptable price). Both of these trailers have been really great for storing stuff and opening up my work space.