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They are big but they are good for more then just the campground.
That's a good driver....and note he's on the small 295/60r22 tires in what appears to be an 08-10 F550 ER. One shortfall in the ER design is the lack of a "gear garage". That said, you can fit a decent amount of kit in the rear gear lockers and storage boxes plus bike rack. My guess is the designers hit the limit with 90gal fresh water, 90gal diesel, shower, toilet dining area, king-size bed, kitchen, etc. some folks want for comfortable ~2 adults+2 kids camping year round with decent offroad 4x4 ability....the gear garage unfortunately didn't or couldn't make the cut. They might have designed a rear lift to hold spare wheels (2 better than 1), a large gear box and mount for a motorcycle and/or bunch of bicycles but that would be putting more weight on a rear axle that is already bearing ~twice the load vs the front axle. ER works hard to keep the full Ford warranty on all the "Ford" components (engine, chassis, etc.) which might also limit the amount of wiggle room the designers had. One issue putting trailers on these rigs is the hitch height. My hitch receivers are 36" off the ground on the ~43" tires. There are ways to hook up a trailer of course but it is more complex than on a regular truck, especially planning for offroad driving not blowing down the highway in a truck pulling a flatbed trailer, a couple of sidexsides and yetis full of dogs and cold ones for another type of fun altogether. Another issue is weight. ER's weigh16k-21k lbs+ loaded (the newer ones, XVLTS/XVLTSS, are longer and heavier than the older ones...no idea re the carbon fiber LTI model weight fully loaded) and, depending on trailer weight, could get close to what engine and chassis can safely handle+what the driver wants to handle. That said, it would be easy to pull a jeep but no real reason for most to do so unless real wheeling is the task at hand. They are actually pretty capable offroad, great in snow&ice with the right tires, and not much longer than a longbed full-size pickup. Height and width are probably the number two and three challenges to offroading with the number one issue being driver experience, prudence and confidence limits. If Hertz rental cars rented out Earthroamers we'd probably see some great video on youtube showing just how far these things can be pushed but until then, ER drivers out there are definitely going to have a lot of fun but probably miss out on some of the more extreme routes simply due to size. There will always be highly-polished, rarely driven garage & driveway queens plus bad drivers getting all sorts of good trucks in bad situations to make the youtube hitlist.
