A 1:25 is a 1:25. I think.
(I've only completed 3 so far so I may not be correct)
I am putting together a 1:24 Revell Jeep Rubicon now and I was surprised how much smaller 1:24 is compared to say, the Nova SS.

I would like to start on military models other than planes, I have done planes.

Disclaimer... Overlook my silly questions, I simply don't have experience yet.

Here's a question, If I order a 1:35 military 6x6 cargo truck, will it be considerably smaller again, or are the 1:35 trucks and tanks relative to their 1:1 counterparts?
Do they end up being roughly the same size as the 1:25 cars.

I had a quick look on wiki for the US 2.5ton 6x6 (Tamiya do a good one) and converting the length to 1/35 would give you just under 20cm if that's any help?

Robin

This link may help, you can enter the scale and size of the original and it will give the model size.

http://www.scale-models.nl/scalc.html

Graeme