I think you may find that any dual slide truck camper will require you to at least partially open a slide to get in. On our Host the back slide blocks getting in but even if that back slide wasn't there the 2 side slide tuck in tight to each other. All 3 slides can open simultaneously so opening the camper is easy. We do this regularly on the side of the road, grocery store, even the gas station while pumping.
Our previous Arctic Fox 1150 did leave a narrow isle to squeeze by but in all the years we had it there was never an instance that we couldn't open the slide(aside from when the motor was broken) to make access easier. Looking at the floor plans of the 2 slide Lance and Eagle Cap I believe you will at least have to open the back slide to get in.