When towing my horse trailer on inclines engine has a problem and starts slowing down.

As a trailer this gets its power from the towing vehicle, you may need to have lights on for the power to the trailer.

Suggest that the engine was overloaded during the incline with the float. At low speeds the cooling is only through the electric fans at the radiator.

Check the user manual for trailer weight limitations. If the vehicle is not equipped with a heavy duty trailer package the transmission may also have overheated during the grade.

The car was likely behaving normally in that any Land Cruiser (equipped as yours) that was connected would have that same result because the load was above the design limits.

Caution in overloading because permanent damage to the drive train engine can occur.

Suggest using a vehicle (ie. Ford 250 truck) qualified to pull a double horse trailer.

Hope this helps?.

A short wheel based vehicle would be the last vehicle I would be towing load of up to 2 tons with. It has the capability to do what you want HOWEVER it does not have the wheel base length to give directional stability when towing. What does that mean ? If you get into a situation where the trailer starts to steer the towing vehicle ( horse moves around and shifts the load position) the distance between the front and back wheels is too short and the towing vehicle will loose control easily.

Towing must be taken seriously and you must therefore make sure the correct towing accessories. A class 4 hitch cannot handle the massive weight of a horse trailer, it is therefore better if you didnt use it but used a class 5 hitch which can handle the loads.

Where is the question this appears to be a statement of an answer to another previous question

I would start by making sure the emergency break away switch has the plunger in it and it's working properly. If everything is OK with that then the 5 pin plug must be wired incorrectly. If you only tow the trailer with that truck I would suggest changing to a seven pin connector on the trailer. It would appear you also have a problem with the left trailer brake. They should work together.

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Trailer Wiring Diagrams 4 Way Systems

4 way flat molded connectors allow basic hookup for three lighting functions; right turn signal / stop light (green), left turn signal / stop light (yellow), taillight / license / side marker (brown) and a ground (white).

4 way tow vehicle side.
4 way trailer side.
5 Way Systems

Same as 4 way system listed above but adds a extra blue wire for brake signal or auxiliary power. Used on pop up camper trailers or utility / boat trailers.
5 way tow vehicle side.
5 way trailer side.
6 Way System, Rectangle Plug 3/4 inch by 1 inch 6 way rectangle connectors right turn signal (green), left turn signal (yellow), taillight (brown), ground (white). The red and blue wire can be used for brake control or auxiliary. Use on a small motorcycle trailer, snowmobile trailer or utility trailer. Can also be used as custom wiring on trailers with 3 light/wire systems. See "Tow Vehicle Taillight Wiring" below.
6 way tow vehicle side.
6 way trailer side.
6 Way Systems, Round Plug

Round 1 1/4" diameter metal connector allows 1 or 2 additional wiring and lighting functions such as back up lights, auxiliary 12v power or electric brakes. Note: The black (sometimes red) 12v and blue electric brakes wire may need to be reversed to suit the trailer. Check with a test light or VOM. Uses: horse trailer, travel trailers, landscaping trailer, car trailer, etc.

6 way tow vehicle side.
6 way trailer side.
7 Way Systems

Round 2" diameter connector allows additional pin for auxiliary 12 volt power or backup lights. Uses: heavy duty landscaping trailer, car trailer, boat trailers, horse trailer, travel trailer, construction trailer, etc. Check with a test light or VOM.

7 way RV flat blade tow vehicle side.
7 way RV flat blade trailer side.

tow mode gives ur transmission a longer shift point to relive strain on engine while driving -it doesnt give it more horse power to start off a hill

try this out

http://changingears.com/rv-sec-tow-vehicle-sizing.shtml

Towing capacity for any vehicle depends on the engine size along with tire size. the towing capacity should be on the ID tag on the driver's side door and will also be in the owner's manual.