If you've had zero issues with your current brand, why would you change? Is it the tire dealer trying to get extra dollars out of you?
As for Goodyear Endurance, I bought a full set of them immediately after they came out and within a month had a major blowout that damaged the fifth wheel (about $3,000 which Goodyear did pay for surprisingly). I had tire failure on two of the other Goodyear Endurance tires (with no damage, but big delays), so I have little faith in them. Maybe they've improved since then, but that bad taste just won't go away.
Currently I have Carlstar (formerly Carlisle) on my fifth wheel and a TPMS system and have had zero issues in two years. Make sure they're at 80 PSI before I leave and let the monitor keep me informed.
Because of my good experience with Carlstar, that would be my recommendation - or, once again, just replace with what you have since you've been happy with those.