Trailer issue ( Garage Clearance )

Would a 13" wheel fit over the brake drums?
I suspect the tyres you have are designed for a high load, low profile tyres may not be. If you reduce the diameter the rear of the trailer will be lower when attached to the tow vehicle, will that matter?
 
unless OP tells us the weight of the boat+trailer and number of tyres (assume 2) we don't know, but David I doubt a 400kg per wheel weight tbh.
Not to mention if the boat is 2ton or so, neither the 185/65X14 will do of course!
So only reasonable solution imho is MrB and that is assuming yet again surface is really flat with no fancy drainagle grates or other disruptions that would block the tiny wheels of such a dolly...
 
Friend of mine years ago looked after a single seat racing car for a wealthy chap. He got a new transporter for the car too tall to fit in the storage so he just got the ground at the door lowered!
 
The “C” on the tyre denotes “commercial” I.e. it’s a van tyre - much higher pressure and load.


You could deflate down to 15 psi or so as long as you only go very slow, make sure you reinflate correctly after or you will damage tyre. And don’t leave deflated in garage or it will distort badly
 
Old fashioned coach houses have wheel tracks cut away into the cobble base so your carriage can be rolled and drops to the axle height but rather went out of fashion with coming of the horseless carriage. Don’t know how many coachhouse garages still exist now but in our previous house the garage coach tracks had been infilled by a previous owner with soil and wooden boards but seems cutting a track in the garage floor for the trailer wheels might be a simply solution to gain a small drop in height? Guess it depends on floor construction though but a narrow track might drop the floor height and when not in use boarded in by planks etc.
 
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