The problem you'll run into with a 3/4 ton truck is your limited GVWR. A 5th wheel puts about 20% of its total loaded weight on the truck as pin weight - this pin weight counts against your truck's GVWR. To illustrate, we pull a 13,500 lb 36' triple slide 5th wheel (Jayco Designer XL 3610RLTS). Our scale weights, loaded with full fuel tanks, passengers and heading down the road, are as follows:
21,180 lbs GCW (21,500 GCWR)
10,380 lbs GVW (10,500 GVWR)
10,800 lbs trailer axle weight (12,000 combined GAWR)
2,700 lbs trailer pin weight
7,680 lbs truck laden curb weight
Rusty