Re: Purchasing a 2012 San Antinio, need help on choosing a truck
Ford, GM and Dodge all make good products and each has their fans. I agree you'll need a 1 Ton truck.
All of the big 3 put in Diesels and Transmissions that will probably provide enough 5th wheel towing capacity, although there will be some differences between the three. You'll probably want to get a 3.73 rear axle ratio, which is a good compromise between power and fuel economy.
BEFORE BUYING get the payload spec on the truck you're looking at. This can vary quite a bit across Ford, GM and Dodge with single rear wheel configuration. When I shopped in July 2010, I liked the Dodge 3500 SRW a lot but found it had a MUCH lower payload spec than Ford or GM. Much too low for the Landmark. I would have had to go to a dually for the Dodge to do the job. That may have changed with 2011 or later models, but you need to check this before buying.