Clearly a Class C. Some wordsmith came up with "B+" to describe a Class C without the cabover. Just a fairing from van roof to front of Class C "house."
Dynamax is known as a quality builder. The Carri-Go 210 I looked up showed the very good feature of a full 5-sided rear end cap. Picture a shoe box lid, top and 4 sides for a total of 5. Seals the rear and gets stresses away from corners. The front capping seemed similar. If it has a fiberglass roof so much the better.
If it's a Ford V-10 in that small a coach, likely around 10-mpg, maybe a tad more. 1 or 2 higher if it's a V-8.
"2004 coach" might be on a 2003 or 2004 chassis. Later model is better, but condition trumps features, at least in my book.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB