Welcome to the forum!
A couple of points to consider: Re the Trailmanor, you also have a smaller refrigerator. Standard refrigerators in travel trailers aren't all that big to begin with, and the half size units in a Trailmanor are really limiting.
If you plan on doing any longer trips when you retire, you have to consider storage space of any trailer you consider. Some folks can travel very light, others need more stuff if they are going to be gone for more than a few days. So, you have to figure out what will work for you. I've seen some retired folks traveling for extended trips in rigs smaller than ours, but the majority tend to have bigger rigs.
Since you are just getting started, I would also suggest buying something used that will meet the weight limits of your vehicle. Do some camping and traveling and over a couple of years, you'll learn what you need and like. Then, you may find yourself upgrading to a TV that can tow a bigger travel trailer.
We're happy with our rig...1/2 ton pick-up and 26'9" trailer that we can live in comfortably for 2-3 months. We'll be headed out on a 6 week trip (Grand Tetons, Yellowstone and Glaciar National Parks) after Memorial Day, and we're just fininishing a 2 1/2 week trip where we took a break from the cold Ohio weather in Florida. Next year, we're looking at booking two months in Florida and take another 2-4 weeks in travel time to Florida and back home.
Once you have a full height travel trailer, gas mileage is going to suffer. We average between 9 to 9.5 mpg. The way I look at it....if you are going to go any long distances, you might as well make it for quite a bit of time as the fuel costs can be larger than your camping costs. So, we just plan our budget accordingly. But we love seeing new places....just discovered St. Marys, GA and Cumberland Island on our way home!
Good luck on your shopping, and I hope you're on the road and enjoying soon!!
Retired but busier than ever!
2013 Winnebago 2201DS - 6,200 lbs. or so loaded!
2007 Tundra 5.7