Got wifi briefly, so I will be.
An SUV has a heavier body than a pickup, so less payload.
Large 1/2 ton trucks have lots of storage behind the front seats. With tonneau, better rear visibility for backing and fair amount of storage. Dirty stuff goes in truck bed—hitch, gas cans, water and sewer stuff, generator, etc. You can't do that in an SUV unless you want to create an area for that and watch damage to interior, seats and carpets. Do you want gas cans and generator inside an SUV? Some do it and it works, some worry about fumes and spill—something worth thinking about.
EcoBoost truck is fairly new and bugs still may have to be worked out. I don't think that engine is offered in an SUV yet.
New, large gas engines in 1/2 ton trucks with auto transmissions can pull any 25', 27', or 28' trailer, but payload has to be watched.
Moped in trailer—ability to secure it is limited inside trailer and it will bounce and may break free causing damage to trailer. Gas and oil comes with it and any spills inside could be a bad mess. Even securing anything but a folding bike can be difficult in the trailer.
4x2 doesn't get you off wet grass, sand and bad roads easily. Even people in Fla, Arizona and Cal. buy 4x4 in case of getting stuck. But 4x4 weighs more, cutting payload. It may be harder to get complete tow package with 4x2 trucks. You need the complete tow package.
Payload varies a lot with different trim lines. On Tundras it can run at least from 1,300 to 1,700 lbs., so model selection is important. All payload and tow capacities can be found on manufacturer websites with some exploring, at dealers (sometimes) and sometimes other sources.
Armada pleases some people, not others who say it just doesn't have tow capacity but is nice truck as a daily driver. Older design and may be phased out, but people have been saying that for years.
Some trucks will do fine for 50,000, 75,000 or more miles, but because you are at or over capacity (easy to do), but the drivetrain, brakes, etc., will wear faster and eventually that catches up to you. Given your truck or SUV a margin to reduce wear.
You don't need a diesel to tow the size trailer you want. Modern gas engines are up to the job with proper rear axle ratio. Payload is determined by suspension and that's why some go to 3/4 ton trucks, but managing weight carefully can mean a 1/2 ton works fine.
A lot of large SUV's are loaded and cost $40-50,000 and up. All those standard features and options add weight, so payload may be less than you think if you don't add in options weight. You can get a good 1/2 ton pickup with tow package and large cab for a lot less. We paid just under $30,000 for an SR5 Tundra with tow package, 4x4 and 5.7 L. engine in '07. For that matter, a 3/4 pickup should cost less too.
Good luck. There's a lot of research to find the tow vehicle that works for you.