hi Roger, I don’t know anything about it and have never heard of a 4500. that is why I posted it here. I was getting an inspection at the dealership this am, and started walking towards the low roof 144 black thinking it was my 2017. then i realized what it was, and then i realized actually I have no idea what it is. Are you interested in buying the van? it did not appear claimed as 3 2019 sprinters were lined up w the sliding doors open for all to explore. i thought the low roof was discontinued/special order now. anyway I was surprised by the sticker price, seemed pretty reasonable for whatever a 4500 is w duallys, in jet black. it did not have 4 wd however. I really like the low roof 144 vans. was happy to encounter this stout beast. 4500 is almost double 2500. it must be for towing something? or towing anything, rather.