The problem is that tele's don't have standard sizes. You you chose 3 or 4 24 inch TV's (from different companies) and they'll all have different outside dimensions. Plus, you may chose to mount it in a different location using different mounts.
Wait until you get your camper, decide where you want it, measure it and then go shopping.
2008 Jayco Eagle SuperLite 29.5
2014 F250 6.7 PSD 4X4, CC LB