Looking for help/advice on truck purchase

[RStewart]

I'm thinking about trading my cascadia for a different truck. The trucks I'm looking at are: 2013 & 2014 Pete 386s, low to mid 400k. 450 hp ISX in them. Trucks have APUs on them as well. Trucks were owned by a fleet that has about 400 trucks I believe. Prices are $56k-$63k depending on year & mileage.

2015 Pete 579 same specs & mileage as above. Price $77k.

Here's a link to the trucks if anyone wants to see them. http://m.heartlandusedtrucks.com/List/Truck/ForSale

I'm also interested in a KW T660 because I want the studio sleeper. So I'm looking for one in the 2013-2015 years.

I don't know much about these ISX engines yet so I'm not sure what years/engines to avoid.

I appreciate any help/advice from you guys. I'm not against demandating it if that needs to be done.