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you should be fine with the standard genuine Isuzu tow bar. The rear of the vehicle may be down a bit when fully loaded depending on weight of pop top. weight distribution in pop top is the key. You can fit heavy duty shockers (GAS) & air bags to rear suspension if needed for light vans. They go inside the rear spring coils. The Hayman Reece & sway bars will raise the rear & take weight off of the tow ball but this has not been tested by Isuzu & warranted. Sway bar hitch does not fit on the genuine Isuzu tow bar also. The best thing would be to talk to an Isuzu Dealer such as North East Isuzu Ute at Burton, Adelaide, South Australia to work out your best needs.
How do I find my hitch system rating?
Your hitch system is comprised of three components, the Hitch that is attached to the frame of your car, the Ball Mount (drawbar) and the Hitch Ball. Each component has a rating for capacity. The LOWEST rating of the three components determines the overall rating of your complete hitch system. For instance, you can have a 3500 lb hitch and ball mount, with a 2000 lb ball. Your hitch system is limited to the 2000 lbs towing capacity. https://www.uhaul.com/Articles/Tips/33/How-To-Determine-Your-Hitch-System-Rating
most tow bar specifications state 300-400 kgs is the maximum weight allowed ( best if the toyota is a long wheel base ) if you have something heavy on the bar you should be using load lever stabilizer bars from the bar to the "A" frame of the towed unit these effectively reduce the weight on the ball by transferring the load to the vans wheels and the toyota front wheels they reduce sway from uneven roads and passing trucks, improve driving stability on the toyota and reduce the load on the toyota drive tires you measure the tow ball weight by lifting on the ball coupling of the van best talk with bar specialist fitting shops and retailers that sell van accessories don't forget you are legally limited by the weight you can tow by the vehicle towing specifications and for most late vehicle that tops out at 3000kgs --early vehicles it is less than 2000kgs
You can tow just about anything with anything if you have the right gearing. BUT, Your limit is set by the kind of hitch (class rating) you are going to use. I use a simple rule of not towing anything more than double the weight of the vehicle you are pulling with. In towing heavy loads you will need an electric trailer braking system, stabilizer bars, lighting harness addition (applies overall...some require an add on module additional to wiring to prevent system damage), heavy duty radiator and an external transmission cooler. (also, more frequent trans fluid changes, best to use synthetics) If you will be towing on a regular basis, I'd also look into getting the "police package" in regards to sway bars and shocks (all around) as it helps with control.
You may be getting into a very dangerous situation. You definitely need a tranny cooler, a brake controller installed in your van, electric brakes on all wheels of whatever u r towing, an oil cooler (engine), and u still may be in big trouble. Factory towing packages usually include heavy duty brakes, alternator, heavy duty suspension, bigger tires, sway bars, etc. So even w/ some add-ons u still won't match a factory set up, meaning u shouldn't tow that much weight. Check out edmonds.com/ownership/howto/articles/44921/page001.html for more info, be careful, and good luck, countrycurt0
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