The number one priority with tug and van is get it right first time, especially if your intending to have the combination long term. If you need to change vehicle to tow the van you want then do it. You don't want to be sitting in a caravan park in the future looking with envy at the van parked next to you that you should have bought. You don't want to be changing vans after six months and losing money.
My 2CW.