<div></div><div id="QUOTEHEAD">QUOTE</div><div id="QUOTE">Unless you're lifting fairly light weights (-200 pounds) squats 3x and deadlifts 2x a week would be a killer.</div>
Well, that's why I reckon the volume has to be watched. I do deads and squats three times a week each up to 5s and only alternate once I'm in the 5s. I don't want to do this but once I'm over 280lbs in deads and 250lbs in squats my poor little spinal erectors need less volume so I alternate. It's been working well so far.
Now I've had another think, up until 5s you could do SLDLs rather than deads on Tues & Thurs and leave out SLDLs on M/W/F. Then during 5s do deads instead of SLDLs. Doing squats & SLDLs 3 x weekly and deads 2 x weekly would be too much (except perhaps during 15s if you only did single sets). See what works for you.