RV Station just south of Fitch had a good selection. Family owned I think. Sales team was very helpful not pushy. They also rent some trailers out to try before buying.
There's a decent looking Lot off 6 in navasota. Never been there though. And I've heard good things about the RV lot 3-4 miles south of Hearne on 6.
RV Station if they sell a brand you are wanting to buy. T&S out of Navasota gets good reviews and owns the one toward Hearne now also. They also get good reviews.
If you are wanting a travel trailer and for some reason find yourself in the Round Rock area, check out Princess Craft RV. They are on the I-35 northbound frontage road. Very nice people to deal with.
PPL is super solid. No complaints here. Only downside is not being able to walk off the lot with the RV. Gotta go through the negotiations with the seller and come back later to pick it up. Lots of selection when we bought ours if you aren't sure what you want.