Yes, the Monroe Sensa-Track Load Adjusting rear shock absorbers totally got rid of the sag in the rear. Monroe part number 58617.
My Explorer didn't look quite right before and now it DOES look good. Not to mention that the original shocks were shot and the truck badly needed new shocks. And more importantly, it now rides well (maybe a tiny bit more firmly than I'd prefer) and I think it now sits at the correct height (maybe even 1/2" to 1" higher than stock in the back, but I don't know that for sure- its just a guess).
The cross member in the rear to which the upper part of the rear shocks mount is strong on the Explorer (in my opinion). I wouldn't worry about it breaking that cross member. Yes, I know that adding stress to the shock mounts on some cars can be a precarious thing, but on the Explorer that cross member is thick gauge steel and I doubt that it would be an issue.
As I mentioned, I used Monroe Sensa-Trac Load Adjusting Shocks, part number 58617. They come by the pair, so only order one. The pair cost $92.50 at Amazon. Amazon charges sales tax (a ridiculous 9.5% here in WA state) and I selected the free shipping. But the free shipping is slow, in my opinion. I ordered everything (2 front shocks, the pair of rears, the dampener for the rear diff, and a shock boot) on Sunday morning and received them 8 days later, on a Monday afternoon. RockAuto's prices were a dollar or two more for each thing I would have bought, they don't charge sales tax but DO charge shipping. I've bought a lot of stuff from RockAuto and know that I would have received them BEFORE the following weekend and it would have only cost me maybe $10 to $20 more overall. I mostly went with Amazon because someone gave me a gift certificate that I wanted to use.
I would definitely recommend these shocks to people with sagging rears because 1. the TOTAL cost of eliminating the sag AND getting new shocks was $92.50 plus tax, and 2. you can do ALL the work to replace the shocks in 45 minutes and with four wrenches.
I went to the Monroe web site to see what shocks they recommended to use with what other shocks. Based on that I bought two Sensa-Trac front shocks, part number 911122. I also bought what most sites call the "Steering Stabilizer Shock". The name is totally wrong, in my opinion. The Monroe SC2958 is a dampener (stabilizer) for the rear differential. Lastly I bought one Monroe Shock-Mate boot kit, part number SA1997 (the "kit" consists of a boot and one zip-strip). They come in every different color and doubt they would fit all shocks easily. I put the boot on the rear differential dampener "shock".