I’m thinking about changing my Huawei B535 for a Teltonika rut950, also considering the 240 but not sure which would best.It's the RUT955 which has twin antenna sockets. In hindsight it is a bit of overkill as it takes 2 sim cards which I don't need. They do other similar models for single sim cards which may be more suited to a typical MH installation.
But mine has worked well connected to a Poynting antenna.
I’ve just got to be brave and buy on, hopefully they would be relatively easy to set up for roaming, I’ve already got a Poynting antenna on the roof.