We advised you to come by air, but if you insist, please remember that you will have to face long queues to enter and leave Belarus, and if you bring own guns it will be really painful - prepare to stay locked for up to 4-5 hours for customs controls. We will send our representative to assist in customs formalities for firearms importation, to be met in Poland or Lithuania, you will have to assure a seat for him in your vehicle on both way.
And then, you will have to pay for the roads.
The official information about toll roads in Belarus can be found on the website of handling company - Beltoll.
First of all - don't try to pass on paid roads without paying - they will stop you, if not at the moment they will do it later, but they will. You will pay 100 Euro per each passed control point which are found every 10 km or even more frequently.
Before your trip download the full map of toll roads from their site. If your itinerary has even 10 km of their roads go and buy their gadget. You will find them on the first filling station after the border. It will cost you 45 euro - paid by card or in cash in roubles. 20 of them is the deposit price which you will get back when you leave Belarus and give away their gadget before passing the border. 25 of them are to cover eventual toll road kms you'd make. Every check point you pass will reduce your 25 Euro balance counting kilometers you make per 0.04 Euro. For example, Brest - Minsk would cost you 14 Euro (we are talking about normal vehicles up to 3.5 t). The rest of unused money will be given you back together with the deposit on leaving. If you need more than 25 Euro for Belarusian roads you can charge it on lots of gas station on toll roads.
Do not forget to attach this device in quite open position under the windscreen - if per any reason it will not be recognized on any check-point you will get the fine of 100 Euro per each check-point passed.
The vehicle's owner (or the person who imports it) should be the only one to drive it in Belarus, no other persons are allowed to do this.