Works are definately the best option....As for reservoirs, you can definitely do without them.....I have actually only ran them once....The shock oil does get hot,but according to suspension experts, the worse case scenario for shock fade due to heat is only a 10% fade and will probably ever be noticed...
Threaded pre load means the shock body is threaded with a large nut on it allowing for the ride height of the machine to be adjusted by tightening/loosening the nut..... This raises/lowers the upper spring rest adding pressure to the spring and raiseing the machine...It really isn't necessary either since the works shocks have a snap ring that does the same thing, just a little harder to do... Once I got mine set where I liked it, I havnt moved it since.....
Hoodlum