Towing a jet ski...........no problem. Giant horse trailer with multiple horses inside.......f#cking scary dude!!! Your 4.10 gears are not gonna help. Clutch is gonna hate it. Is your clutch/hydrolics still all stock? Does it have 50k miles on it?
Your asking for a lot to tow that big ass trailer with your RC. I burned up my clutch slipping it at the track several times. I cringe at the thought of pulling that trailer, knowing that your gonna raise those rpms as you let the clutch out slowing trying to get it moving. Any kind of hill and your really f#cked.
Your better off borrowing or renting a truck when you need to tow. Clutch system replacement with labor...........about $1500.
patrick