Clothing/Shoes/Weather Gear: Although you can probably leave out your snow boots, I would suggest being prepared for almost any other kind of weather (especially in spring)! You can never tell what the weather is going to be like. One day it is a hot, dry, 95 degrees, and the next day is 70 and raining. I would definitely suggest being prepared for the rain. You will almost definitely encounter some!
Clothing/Shoes/Weather Gear: With all that concrete covering most of the ground throughout the Metroplex, Dallas tends to retain the heat of the day well into the night. So, if you will be in Dallas during the summer months, take lightweight clothing. It gets bloody hot...I mean damn hot!!!
Luggage and bags:
Take less as possible with you when you travel.
Clothing/Shoes/Weather Gear: Summer months, leave all your heavy cloths at home.
Take only the light once like the linens stuff
Toiletries and Medical Supplies: Travel light, when you need any thing you can just pop in to 24 hour stores like Wal-Mart and get all your stuff. So why bother take things you don't need to take when you can buy it there ?
Photo Equipment: Take all you grear if you want to.
Camping/Beach/Outdoor Gear: No idea. But I am sure you can camp out very comfortably if you got the correct gear. But always respect the local rules and law.
Miscellaneous: Have a great time. Enjoy your travels.