Suburbans and Expeditions have similar hitch ratings and tow ratings, but the Expeditions typically have a higher PAYLOAD as compared to similarily equipped Suburban 1500. This comes into play when you want to carry several people and stuff in addition to towing a trailer. For example, my 2007 Expy EL XLT with leather, power sunroof, and rear AC has a maximum occupants and cargo rating of 1672lbs, and a GVWR of 7900lbs. That is higher than a lot of 1/2ton pick ups! The Suburbans often come in at 1400-1500lbs of available payload. Which means if you hook up the same trailer, you will be able to carry less people/stuff in the Suburban. With my growing family of 5 plus an occasional relative, this matters.
We LOVE our 07 Expy EL, here are some of the features that lead us to choose it
The Expy EL has a high payload, more than many 1/2 ton trucks. Many other 1/2 SUV are less, some A LOT less. BE SURE to check the yellow sticker on the door sill of any SUV you look at. It will state exactly how much payload that vehicle with it's factory options can handle.
The EL was introduced the same year as the 6spd. EL comes with 3.73 gears standard, coupled with 4.17 first for an overall low of 15.55 That is lower than the old 4 speed with even 4.56!! And with 300ft lbs available at 1800rpm, it has no issue getting anything moving.
The shifter allows locking into 1st, 2nd or 3rd. And yes, if you put in 3rd, it will stay in 3rd, even from a stop. In D the transmission will use 1-6, the OD button locks out 5th and 6th. 4th is actually a slight underdrive of 1.14:1, which gives a final ratio of 4.3. Yep, the same as towing in "direct" with the 4spd and 4.3 axle gears. A LOT of thought was put into the ratios for this transmission.
The 5.4 while maybe not the most powerfull, is still 305/365 with a broad torque curve and is proven reliable. I get 12-13mpg around town and 17mpg highway crusing. About 9mpg towing. 33.5 gallon gas tank means range is decent.
As a family hauler the EL is awsome! Our 3 kids are all still in massive Britax carseats, all 3 fit snugly across the middle seat. A double and single B.O.B. live in the back of the EL with plenty of room for whatever else. The 3rd row is a 60/40 split. In about 2 minutes I can fold up the 40 section, move 1 carseat to the back, and have a spot for adult in the 2nd row with easy access to the carseat in 3rd row, with the 60 section still down I don't lose much cargo space. Thanks in part to the fully independant suspension the ride is smooth, luxury car smooth. And very quiet. With good tires there is very little noise inside, and you really only hear the engine when you get on it. The EL 3rd row has nearly as much legroom and seat height as the 2nd row. No complaints from 3rd row passengers. Even with 3rd row up we have room for 2 jogging strollers and several overnight bags. We took 8 people including our 3 kids and all our stuff to Vegas for a weekend. A bit tight but we made it.
Fold down the 3rd row (you do NOT HAVE TO REMOVE IT like GM) and you have just over 5ft of floor and a full 4ft between the sides. Fold down the middle row (again, does not have to be removed) and you have just over 8 feet. I have brought home all kinds of sheet goods and lumber from Home Depot. I have also brought home a full size reclining sofa!
On the Expy EL the towing package includes a bigger trans cooler, HD radiator, HD flashers, wiring for brake controller. For the Expy quick way to tell if has towing package is to look for the 7 pin plug on the back. If it is there, it has tow package, if just the 4 pin, no tow package. I believe for at least the 2007-2010 timeframe the Expy EL was the best of the bunch.
Let me know if there is anything else you want to know about the EL.