Oh Joy! You just sent me on a mission. I'll dig into Thor Industries brands and list them here. Lets start:
Aerolite 205KB by Dutchmen
Coleman by DutchmenCTS14FD:

CTS15BH:

CTS16BH:

CTS16FBS:

CTS184BH:

CTS192RD:

CTS231BH:
Dutchmen Floor plans, click here.190QB:

255RB:

275BH:
Dutchmen - Aspin Trail1700BD:

1900RB:

2500BH:

2510RB:

2710BH:

Here's a link to Dutchmen Razorback Toy Haulers (Trailers) that do not have slide outs - 4 of them do not have slides:
Click here.Continuing the Edit:
Keystone Bullet - Click here:204RBS:

204RBSWE:

210RUDWE:
Keystone Hideout:210LHS:

230LHS:

260LHS:

More Edit (I'm getting tired...)
Keystone (West:
179QBWE

189FLWE:

190SRT:

202QBWE:

Well, ya know, I think my fingers are tired from all this copy-paste. Suffice it to say, there ARE a bunch of campers available without slides. Here's the link to Keystone RV. There's still a bunch more out there under different brands:
Click here. Enjoy your search!