Is it possible to play with people that have the trainer?
well it depends if they have their modded console online using stealth etc
stealth is free now so there are a lot more people online with it
So essentially it is possible
its possible. not sure how many people have the trainer though. as far as i know, idlehands88 and like 2 others have the only good trainer other than max ammo. not sure of any others out there. but yeah you can play with them. beware though, by joining their fireteam, you could be banned as well. not sure on the ban rate for that but figured since youre joining in on their mods