I had the same problem bringing my M109 home. It was a couple inches too tall.
The M109 is too tall to be legally towed on many trailers.
The easiest thing to do is to let the air out of all the tires once on the trailer, and it will drop the truck by about 4-5", which should bring you down to legal height. Just bring an air hose with a glad-hand connection to refill the tires when you have to take it off the trailer (if you cannot get the trailer close enough to an air hose at the drop off point). It will take a while to refill all the tires with the truck air, but it will get the job done.
Just make sure to tie down the truck to the trailer AFTER you have dumped the air out of the tires. If you do it before hand, the chains will become loose, and you will have to tighten everything back up again afterwards.
The M109 is too tall to be legally towed on many trailers.
The easiest thing to do is to let the air out of all the tires once on the trailer, and it will drop the truck by about 4-5", which should bring you down to legal height. Just bring an air hose with a glad-hand connection to refill the tires when you have to take it off the trailer (if you cannot get the trailer close enough to an air hose at the drop off point). It will take a while to refill all the tires with the truck air, but it will get the job done.
Just make sure to tie down the truck to the trailer AFTER you have dumped the air out of the tires. If you do it before hand, the chains will become loose, and you will have to tighten everything back up again afterwards.