Oh my God, no locking bars, seriously.
The locking bars, are a type of thing you put over top of the slide out roof, once it is ran inside, that extend to put pressure on the slide out to keep the top portion from tipping outward while traveling down the road.
If you've not already, might ought to look any & everywhere in the coach they could be hiding, like under a seat, under the bed or out in a compartment, but there should be some locking bars for that slide out.
Only reason I could think of your coach not having them, would be if theres a different type of extending unit to extend the slide different from the cog type like on ours.
1999 32' Holiday Rambler Vacationer, F53 V10
Wife & me love camping at a race track, dirt track that is.