I will add to OTRFUN, where do you live? Neighborhood roads and parking 8k or less? When you drop the trailer do you want to run on parkways or the hammer lane in the Northeast? Do you need get a commercial ezpass in your home state for the 35 trucks? If you say yes to these questions then the 25 or 35 truck matters.
When you drop the trailer, will you play in the mud or snow with the truck? Then dual rear wheels are not as much fun.
In some national forests and parks out west you may be limited by length of your 4 wheel drive truck. To get to Torrowheap(sp) in Grand Canyon Park even a crew cab short bed would be too long according to the signs. Should not be bigger than a club cab. Might save money on some ferries by length too. Buy the tools to do your job, but consider all the angles (literally).
