Why not gasser rear enging?

There was a really well-engineered rear-engined gasser on the market for a while, made by an outfit called "Special Interest Vehicles" if I remember correctly. It had a space-frame combination body/chassis of their proprietary design, with automotive industry (Dodge, I think) suspension and a ZF transmission. The engines were Fords, the 460 in early versions and V-10 in later ones.

I think the company is still in business, but not making RVs any more.