Guys I am hoping you could tell me why a spring collar would be better then running a spacer. I'm looking to pickup 1-1.5 inches in the front. I feel like by add the spring collars your effectively putting more spring preload which should change how the ride is. Vs a spacer that doesn't change the spring preload. Im not looking to change ride characteristics, just want to get rid of some of the rake in the front end.
Are you talking about a spacer that mounts to the top of the coil over like a standard F150 leveling kits or a spacer that goes under the spring like the BajaMod spring spacer?
The Bajamod spacer does the same thing as a collar like RPG, it just installs differently. It will increase preload but not change the travel.
A spacer that mounts to the top of the shock will cause the shock to bottom out on compression. Do not run a space on the top of the shock. As for the other options it comes down to the amount of lift/preload.
RPG-1.5" or 3" of lift available
BajaMod- 2" of lift
SVC-adjustable from 0-~3.5" of lift