Finally, I will be traveling with my wife and two young children. Basically I just want to know what weight of TT I should be looking at.
Any help will be much appreciate
Use about 15 percent of the trailer's gross weight for a tongue weight estimate. For example if a trailer's
gross weight (not brochure or dry weight) is 5000 pounds the tongue weight will be around 750 pounds plus the weight of the hitch that could be another 75 or more pounds. Then add all the weight of the people, tools, bbq, bicycles, kayaks, chairs and other stuff and subtract that from the payload available. If you want to get real technical about 20-25 percent of the redistributed tongue weight by the weight distribution hitch is carried by the trailer axles not the truck. A 10,000 pound trailer that fits within your truck's towing rating would have a tongue weight that consumes most if not all of your available payload not counting anything or anybody else.
The 'rule of thumb' in RVing is to get the RV first, then get the truck to tow it.