Iím still too much of a newbie to instruct others, but I am happy to share my experience.
Iím pulling a 34í 1989 Avion GVWR 9995, hitch weight 850.
TV is 2008 Toyota Sequoia 5.7L (401 ft lb torque
) with towing capacity 10K.
CAT scales says trailer axle weight 8600 fully loaded.
No idea how old my hitch is. It has no discernable brand markings. Itís a class IV with round spring bars. I donít have any pics of my hitch, and the trailer is parked a half hour from here. Iíll try to remember to take a few shots next time weíre out. How many inches rise on the jacks? Not sure I know what youíre asking, but I think the answer is 2.
The chains on the spring bars are welded on and showing some wear. I hitched up and took it to a local RV dealer for advice. He didnít have what I needed, but it was nice to have a pair of experienced eyes to look over my setup. He set some of my fears to rest, but raised a couple other issues. Most were addressed when I reassembled the hitch.
The dealer said it looked like I had 800 lb spring bars, and suggested I move up to 1K lb. He said if theyíre too soft it will porpoise, but if too stiff, it will make my ride harsh. This may explain why your ride is so uncomfortable if you have 1K spring bars on a 19í trailer with 500 lb hitch weight.
Since Iím operating at about 90% of my TV capacity, I do watch how things are loaded. I donít carry excess baggage heavier than a pillow in the truck, lol. Everything gets stowed in the trailer.