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Question on axles
Good chance that's a 7500# suspension with the wrong tires. I'm guessing you have 205/70 or 75 mounted. If it had 215 or 225 tires you'd probably be able to carry the suspension's rated load. Wouldn't hurt to inspect the axles themselves for tags/labels. They're ordinarily put there by the manufacturer.
The rating by the way, includes the weight of the trailer. The four tires are rated at a combined 7340#. Subtract the weight of the trailer - let's say a ton - which means you can carry 5340 pouhds.
//greg//
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Question on axles
Yeah, there are 205s that are are suitable for a pair of 3500# axles, but your tires are almost certainly for automotive applications. Don't think I've ever seen a 70 series for trailers. Trailer tires usually have a 75 or 78 or 80 profile, and often begin with the letters ST; like ST205/75D15 (typically rated 2150# each).
//greg//
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Question on axles
Assuming the typical pair of 3500# axles (7000# gross) on a commercially-built trailer, I think 5500# would have to be net. The ST205/75-15 six-ply rating is usually 1820# each; total 7280# total. Since the axle rating is less than the combined tire rating, subtracting 5500" from 7000# axle gross accounts for a trailer weighing up to 1500#.
I guess the next question would be, radial or bias ? Personally, I'd get bias.
//greg//
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Question on axles
Having previous experience towing with half ton General Motors products, there's a huge difference between the towing ability of the boulevard cruiser 305 and that of the workhorse 350. Given your estimated load, I wouldn't even consider using a 305 engined half ton ESPECIALLY one without a towing package. If you have the 350 and an automatic, do NOT tow in overdrive.
Radial tires are designed for "radial tuned" suspensions, built to flex more in the sidewalls. On a trailer with straight axles and leaf springs, you do NOT want sidewall flex. With radials on, you'll KNOW there's a trailer behind you. With bias ply, you might forget it's there.
/greg//
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