You said Ace, but then Vegas 25.2. The Vegas is built on a van chassis, and the CHF, cheap handling fix, doesn't apply. Like gbrown, we have a 25.2, and I agree with his suggestion for alignment first.
We did only that with our new 2016 25.2, then drove it for about 20K miles. Last summer, I replaced the shocks with Bielsteins, and just recently added the Sumo Springs to the front. If I do any more, it would be to install a bigger rear sway bar. I won't be adding the Safety Steer that some swear by. (My last coach, a Class A, blew a front left tire without one, and it wasn't all that scary.)
Rather than spending on suspension mods right off, I had HWH stabilizing jacks installed. For us, that was a better use of funds. Like Bob said, consider the motives of that sales guy. From your pocket to his. (He'll say he wants you to have a good experience.)
Your results will vary!
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