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I'm look for min 6x12 with v-nose. Will haul zero turn, ATVs, small tractor, etc. I may consider a bigger one. Would be nice to have 4500 lbs load capacity for larger antique tractors.
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If 4.5K is your MAXIMUM capacity you should be able to get by w/ a dual 3,500 lb axle rig. But if you need to go much higher then you are looking at dual 5K axles and they are fairly rare in off-the-shelf pre-builts but can be ordered.
I've been looking for a 7x16 enclosed 10K trailer for about 4 years and only have found a few used, and they were pricey. I've gotten quotes from quality mfg's for about $4.5K. My primary purpose is/was to haul my household from Alexandria, Va to Fulton, Ms, about one trip every three months.
We are VERY gradually retiring to Mississippi and take our time "putting a load together". I've driven down U-Haul rental trailers, 26' Penske rental box trucks and what fit's out "lifestyle" is to gradually fill a trailer then drag it down when the stars align.
SWMBO however put her foot down at buying another expensive "toy" to park in a driveway and another option, renting a UHaul trailer is about $600 a pop.
So last year I put sides and a roof on my equipment trailer.
First I added sides so I could better carry mulch etc.
Then I added 3/4x4x8 sheets of plywood for sides.
and used 1/2x4x about 6.5 for the roof. I went with only 4' sides because I've found that unless I'm REALLY diligent it's rare I HAVE to pack much over 4' high (like a freezer)
I standardized on 3/8 16 bolts for fasteners. Mostly flat 4" U-bolts, as you can see on the uprights, but also a lot of straight bolts w/ washers and T-nuts. This standardization on the bolts let's me put it all together and take it apart with my trusty 9/16 socket on my DeWalt 20V max drill. It would be a true pain to bolt/unbolt w/ a manual socket wrench
And when I'm done it all comes apart for bigger toys which WOULDN'T fit in an enclosed trailer.
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It takes me about a slow day to disassemble and probably a slow day to reassemble by myself. Materials cost was about $800.
Sure I'd like a fully enclosed trailer but this let's me get by w/ one trailer in suburbia and a 20' driveway. Plus SWMBO is happy.
So PapaP good luck in finding a trailer to suit your needs, be careful in getting something that won't handle your max weight needed. Also if you list your location we might be able to give you pointers to resources near you.
/edit - almost all the wood is PT