Dave -
You should start by looking at the Trailmanor.com web site, looking at specs, floor plans, and other information.
You want a new trailer. The 3326 is no longer being built - the 3124 is the largest.
As has been pointed out, the rear bed in a 3124KB is 78x78 (nominal king bed size). But the front bed is 48x78 - as long as a king, but 6" narrower than a standard double bed.
If you are travelling with another adult couple, be aware that the bathroom is right next to the rear bed, and there is no soundproofing. Some folks care about this, some don't.
Your tow vehicle is more than adequate, even with four people and all their junk. Towing will be super easy.
There is no claim for "1 mpg increase (or decrease)". I think you are misreading the statement, which says "1 extra gallon to tow 100 miles". In other words, if your truck's non-towing mileage is 10 mpg, then it burns 10 gallons in 100 miles. When you hook up the trailer, the claim is that you will burn 1 more gallon, or 11 gallons. This is 9 mpg, so it did indeed cost you 1 mpg.
On the other hand, if your vehicle's non-towing mileage is 20 mpg, then it burns 5 gallons in 100 miles. When you hook up the trailer, the claim is that you will burn 1 more gallon, or 6 gallons. This is about 16 mpg, so adding the trailer costs you 4 mpg. Your truck will be closer to the first case, but either way, not a big hit.
I am in the group that has never had a toilet odor problem, and I am a big fan of the original toilet. I would not have a cassette unit even if free. But that is my feeling, and as you know, others disagree. I wish there were some way for you to check it out for yourself before buying, but I don't know how to do so.
Putting the kayaks on top of the TM makes me really nervous. As has been mentioned, the TM really wasn't built for that. At a minimum, spreading the load to the edges would be a must. Beyond that, is the front shell long enough to carry the kayaks you have in mind? Remember the airco is up there.
If you can convince yourself to carry the kayaks on the truck, I really suggest you do so. Let me ask a question. If your kayaks are on top of the trailer, and you get to the campground, unload the kayaks (as you must), and then set up the trailer - and then discover that the put-in for the kayaks is a mile away from the campground, how do you get the kayaks there? If you would plan to walk a mile with a kayak on your back, then as Rudyard Kipling said, "You're a better man than I am, Gunga Din".
Just some quick thoughts. There are others.
Bill
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