Dynamax Isata IF-255 questions

[dictum]

I am looking for a 2007-2010 Dynamax Isata IF-255 (F-series). It's the smallest 25' with no slides. My question is, how common were these with the standard gasoline engines? All info I found states it had V10 gas as standard with 6.0L diesel as option yet every single Dynamax Isata of that vintage had diesel engine. Are gas engines unicorns, never seen in the wild?

For that matter same question about IF-270 and IF-310. I like the basic design but do not want the troublesome 6.0L diesel engine, much prefer the 6.8L V10 Ford motor. I like truck front, the F550 chassis versus an E-series.