As already noted, select a trailer first then the trailer. In any case, I'd get a 1 ton single rear wheel rather than a 3/4 ton truck. A 3/4 ton truck is very limited in payload and rear axle capacity to carry the pin weight. Max trailer for a 3/4 ton truck will be about a 35' lighter weight trailer.
Use 20% of the trailers GVWR to estimate the trailer pin weight rather than the brochure fiction weights. Also, you can not go by the truck manufacturer's towing capacity. A 3/4 ton truck will reach it maximum payload capacity long before it reaches it's towing capacity. Get the truck manufacturers towing guide and study it and learn all of the terms.
And lastly, ignore the truck and RV sales person on what you can safely tow. If their lips are moving, they are lying.
Ken