theres all kinds of stuff you can do to prevent it from getting packed with snow, ive seen a lot of people put cardboard in they grill to block snow building up while on the highway. also to try and keep the engine bay a bit warmer. the colder the intake air the more fuel you burn. ive seen people used like a canvas tarp under the front of the truck to cover the bottom of the engine from snow, slush, and cold air getting up in there. It also works decent on water crossings, it reduces splashing up on top of your motor.
It all depends on snow conditions as well i dont go out when it gets real deep, there are too many snowmobile riders to wheel safely in the middle winter. when i do go, i always stick to trails that i know there are no stumps.
Another thing i did was bring old snowmobile tracks that have been cut so you can lay them flat, and you have 121" rubber track with awesome traction. ive used them ive gotten stuck, as a base for a hi-lift jack, and another one under the tire thats stuck the worst, a shovel to clear snow away is also a must.