One would guess that the ultimate height of a hardtop EC would depend on user vs design requirements. I didn’t do a scaled sidexside comparison of images but had an Earthroamer XV-LTi in mind: the EC concept truck appears to be about a foot shorter though perhaps it is more. The images on the website don’t give any dimensions but the poptop concept camper portion above the truck cab when collapsed seems to be nearly as tall as the Ram 5500 windows and i estimated another 6-12” would provide adequate height, maybe bump my estimate up a bit, and it’ll be comparable in dimension to Earthroamers, which have plenty of room above the bed. 34” is indeed a formidable amount of additional height and a fine luxury that combines with the more compact collapsed profile to create a package that no doubt appeals to current EC owners and like-minded folks. A hardtop option would be intriguing to others. Another observation is that the camper and the truck cab roof appear to be quite close together in the concept and I wondered if we’re looking at a novel solution that mitigates camper vs truck chassis movement. Good luck with this and let’s all hope full-sized F550/5500 pickup trucks/chassis trucks continue to be available: they are great platforms for campers.