This is not good. Don't do anything that requires sending money.
As mentioned, the engine is a Cummins, not a Cummings and that engine is not a V8 but a straight 6 if I am not mistaken. It has a Spartan Classy? Really? This plus a king size bedroom! Awesome. This is not legit! Period.
We saw an ad on RV Trader for a coach owned by friends of ours (all Prevost coach paint jobs are unique) and we called to ask why they were selling their coach. The were not but someone had found pics they had posted on Facebook or somewhere and used those to produce a fake ad. "Just send up $1000 and we will hold it or deliver it to you where ever you are"!
Don't fall for this. Call, tell them you want to come by and take a look and that will likely be the end of the conversation. The post was done by someone who has very little experience with the English language.