I did it in 2006 and am in the middle of it right now. Having a good base of consistent mileage going into it is very important. That is the best way to recover from marathon to marathon. The smart approach is to run the first and last marathons (Ogden and SGM) at full effort and treat the other 2 as training runs. Of course, I'm not very smart and have a hard time not putting a full effort into any race that I run. Just repeating what Jon said, SGM should be on Oct 3 next year and you get guaranteed entry into SGM if you run the Slam.
Yeah, the middle two will definitely be training runs, especially with so little time in between TOU and St. George. So, which one would you recommend, the Park City Marathon or the Deseret Morning News marathon. I know that neither of these is a fast marathon but I have heard that Park City is very difficult. I would like to do the easier of the two.