Re: 1995 Sportsmobile Dodge 3500 EB body seam splitting...
Yes! That most likely is a serious problem.
Your Dodge van is a Unibody design, with a small stamped-steel subframe below. It does not ride on a real frame like the Ford and Chevy vans. The walls on the Dodge are actually load bearing. Sometimes, window and other cutout placements weaken the walls too much. Likewise, heavy trailers can also damage the structure. I'd take it to a good body shop ASAP.
The Sprinter vans area also a Unibody, but MB is outlines very clearly were the walls can be modified, to prevent structural issues.
2000 E450 dually V10 wagon