Any problem with using smaller overall diameter tires than just wrong speed readout?

I bought a crappy old 4x4 truck just to get around in town during the days when it's snowy/icy. 90% of the driving will be less than 35 mph and the other 10% will be less than 60 mph. I'm looking to get some inexpensive snow tires on rims, but there aren't a lot of options where I live. The vehicle currently has 235/75/r15 tires. One set of rims/tires that is for sale that will fit my vehicle is 205/70/r15. This would be about 2.5", or 9%, smaller overall outer diameter than my current tires. I don't really care if the speedometer is off by 9%. But are there other important issues I need to consider, or will these work fine? Thank you.

Not ideal that small a tire on a fulll size? truck, but they can be used.

will limit your load weight if you plan on carrying much. also need to make sure tire is wide enough at bead to fit on rim. might have to take the rims off the truck to get them mounted, most tire shops don't want to mess with different size tires for liability reasons

205/70/15 are passenger car tires. They are smaller than the tires on my Grand Prix.

Not only are they shorter (26.3" vs 28.9") but they are over 1" narrower.

Being they are going to be passenger car tires the load index is not going to be as much as it would be for a light truck tire. The difference is going to be as much as 500 lbs PER TIRE and could be more. This alone could cause a failure while driving.

There is no reason to put tires that small on a truck, no matter what you think the driving conditions will be.