Newbie in Orlando, FL Looking for Engine/Drivetrain Help

Good Morning YotaScene Group. Newbie here with a 1987 Toyota Pickup attached to a Sunrader RV. Picked up the RV a month ago and going through the whole thing! Looking for ideas to make it run better, easier ways to make repairs, and the best place to get parts from. Any help would be appreciated.

Stuart

Got any pics of it? i would like to see what it looks like.
What size and type of motor do ya have in it?